I am aware that this exists: Referencing page number with only one reference however, my question expands upon it.
Tex file:
\documentclass{article}
\usepackage{natbib}
\bibliographystyle{agsm}
\begin{document}
Reference to the book without parenthesis: \cite{kopka2003guide}
Reference to specific page without parenthesis: \cite[p. 150]{kopka2003guide}
Reference to the book with parenthesis: \citep{kopka2003guide}
Reference to specific page wit parenthesis: \citep[p. 150]{kopka2003guide}
\bibliography{references.bib}
\end{document}
Now I would expect to end up with something like this:
Reference to the book without parenthesis: Kopka & Daly (2003)
Reference to specific page without parenthesis: Kopka & Daly (2003, p 150)
Reference to the book with parenthesis: (Kopka & Daly 2003)
Reference to specific page wit parenthesis: (Kopka & Daly 2003, p 150)
Instead I end up with this:
Reference to the book without parenthesis: Kopka & Daly (2003)
Reference to specific page without parenthesis: (Kopka & Daly 2003, p 150)
Reference to the book with parenthesis: (Kopka & Daly 2003)
Reference to specific page wit parenthesis (Kopka & Daly 2003, p 150)
So is there any way to end up with an actual reference to a specific page without parenthesis (case 2)?
Bib file:
@book{kopka2003guide,
title = {Guide to LaTeX (Adobe Reader)},
author = {Kopka, H. and Daly, P.W.},
isbn = 9780321617743,
year = 2003,
publisher = {Pearson Education}
}

\citein author-year citations is the reason that officially thenatbibdocumentation recommends not using\citeand instead recommends using\citetand\citep. – moewe Mar 13 '22 at 10:45