Unable to add citations

Question

I have a tex file that goes as:

\documentclass[10pt,conference]{IEEEtran}
\input{preamble}
\usepackage{cite}
...
\begin{document}
...
\input{text/introduction.tex}
...
\bibliography{Bib/proj_name}
\end{document}

Bib/proj_name.bib:

@article{Snorkel2017,
  title =  {Snorkel: Rapid Training Data Creation with Weak Supervision},
  author =  {Alexander Ratner, Stephen H. Bach, Henry Ehrenberg, Jason Fries, Sen Wu, Christopher Ré},
  year =    {2017},
  note =    {\url{https://arxiv.org/abs/1711.10160}}
}

text/introduction.tex:

\section{Introduction}
\label{sec::intro}
Recently, Snorkel \cite{Snorkel2017} ...

But, I get:

LaTeX Warning: Citation `Snorkel2017' on page 1 undefined on input line 4.

Makefile used:

LATEX = TEXINPUTS=$(TEXINPUTS):packages pdflatex
PAPER = proj_name
Run once, then re-run until it's happy
Input redirected from /dev/null is like hitting ^C at first error
$(PAPER).pdf: $(wildcard .tex) $(wildcard text/.tex) $(wildcard *.bib)
    $(LATEX) $(PAPER).tex </dev/null
    bibtex $(PAPER)
    $(LATEX) $(PAPER).tex </dev/null
    $(LATEX) $(PAPER).tex </dev/null
    gs -q -dNOPAUSE -dBATCH -dPDFSETTINGS=/prepress -dEmbedAllFonts=true 

       -dDownsampleColorImages=false -dAutoFilterColorImages=false 

       -dColorImageFilter=/FlateEncode -sDEVICE=pdfwrite -sOutputFile=$(PAPER)-embed.pdf 

       $(PAPER).pdf
    cp $(PAPER)-embed.pdf $(PAPER).pdf

Of course, I run it using make. I have already looked at the possible duplicate, but as you can see in the makefile, I am already doing all that. Can someone please help me out? Thanks...

EDIT:

blg file:

This is BibTeX, Version 0.99d (TeX Live 2019/Debian)
Capacity: max_strings=200000, hash_size=200000, hash_prime=170003
The top-level auxiliary file: proj_name.aux
I found no \bibstyle command---while reading file proj_name.aux
You've used 1 entry,
            0 wiz_defined-function locations,
            86 strings with 524 characters,
and the built_in function-call counts, 0 in all, are:
= -- 0
> -- 0
< -- 0
+ -- 0
- -- 0
* -- 0
:= -- 0
add.period$ -- 0
call.type$ -- 0
change.case$ -- 0
chr.to.int$ -- 0
cite$ -- 0
duplicate$ -- 0
empty$ -- 0
format.name$ -- 0
if$ -- 0
int.to.chr$ -- 0
int.to.str$ -- 0
missing$ -- 0
newline$ -- 0
num.names$ -- 0
pop$ -- 0
preamble$ -- 0
purify$ -- 0
quote$ -- 0
skip$ -- 0
stack$ -- 0
substring$ -- 0
swap$ -- 0
text.length$ -- 0
text.prefix$ -- 0
top$ -- 0
type$ -- 0
warning$ -- 0
while$ -- 0
width$ -- 0
write$ -- 0
(There was 1 error message)

Answer 1

The error message from the .blg file

I found no \bibstyle command---while reading file proj_name.aux

means that you don't have a \bibliographystyle command on your document.

If you want to use BibTeX you will need exactly one \bibliographystyle{<style>} command in your document. It doesn't really matter where you put it (it can go into the preamble or the document body), but most people either place it in the preamble next to other bibliography/citation setup or directly next to the \bibliography call in the body.

For the IEEEtran document class I'd probably use \bibliographystyle{IEEEtran}.

\documentclass[10pt,conference]{IEEEtran}
\bibliographystyle{IEEEtran}
\begin{document}
\section{Introduction}
\label{sec::intro}
Recently, Snorkel \cite{Snorkel2017} ...
\bibliography{Bib/proj_name}
\end{document}

As mentioned in the comments, your .bib file should probably be rewritten a bit. The authors must be separated with and and non-ASCII chars need to be escaped. Furthermore, I'd not want to use @article for a paper that hasn't yet been formally published in a journal and is only available on the arXiv.

So my .bib would look more like

@misc{Snorkel2017,
  title         =  {Snorkel: Rapid Training Data Creation with Weak Supervision},
  author        =  {Alexander Ratner and Stephen H. Bach and Henry Ehrenberg
                    and Jason Fries and Sen Wu and Christopher R{\'e}},
  year          =  {2017},
  howpubslished =  {\url{https://arxiv.org/abs/1711.10160}},
}

The IEEEtran bibliography styles supports a url field, though, so I'd actually prefer

@misc{Snorkel2017,
  title  =  {Snorkel: Rapid Training Data Creation with Weak Supervision},
  author =  {Alexander Ratner and Stephen H. Bach and Henry Ehrenberg
             and Jason Fries and Sen Wu and Christopher R{\'e}},
  year   =  {2017},
  url    =  {https://arxiv.org/abs/1711.10160},
}