I have the same problem as presented in this question : How to include page numbers in tufte-book citations?
Unfortunatly, the person who asked the question found the solution without publishing the answer.
Who can specify the elements to add in the MWE:
tufte-mwe.tex :
\documentclass{tufte-book}
\usepackage{babelbib}
\begin{document}
A citation\cite[p.50]{Tufte2001}.
\bibliography{tufte-mwe}
\bibliographystyle{plain-fr}
\end{document}
tufte-mwe.bib:
@BOOK{Tufte2001,
author = {Edward R. Tufte},
title = {The Visual Display of Quantitative Information},
publisher = {Graphics Press},
year = {2001},
address = {Cheshire, Connecticut},
isbn = {0-9613921-4-2}
}
as this code produces bad result as follow, instead of specifying the page of the reference in the sidenote :

biblatexyou should not (need to) add thep.bit to the page number.\cite[50]{Tufte2001}or\cite[50-52]{Tufte2001}is enough.biblatexwill automatically add "p."/"pp." (or a localised version if you write in a language other than English and load babel) as appropriate. – moewe Jun 02 '20 at 09:14\cite[50]{Tufte2001}should definitely be enough to get "p. 50" in the output. – moewe Jun 02 '20 at 09:29