Citations & Bibliography

How to Cite the Same Source Multiple Times Correctly in LaTeX

You'll often need to cite the same paper multiple times throughout your document. LaTeX handles this automatically — just use the same citation key each time. Here's how it works and how to customize the behavior.

Basic: Same Key, Multiple Times

Simply use the same \cite key everywhere — LaTeX automatically reuses the same number/label:

% In your .bib file, define the reference once:
@article{smith2024deep,
  author = {Smith, J.},
  title = {Deep Learning for NLP},
  journal = {Nature},
  year = {2024}
}

% Cite it as many times as you want:
Smith showed that... \cite{smith2024deep}.
As previously demonstrated \cite{smith2024deep},
this approach... Following \cite{smith2024deep},
we extend...

Page-Specific Citations

When citing the same source but referring to different pages:

% With natbib:
\citep[p.~42]{smith2024deep}   % (Smith, 2024, p. 42)
\citep[pp.~42--50]{smith2024deep}  % (Smith, 2024, pp. 42-50)

% With biblatex:
\autocite[42]{smith2024deep}   % Cites page 42
\autocite[42--50]{smith2024deep}  % Cites pages 42-50

Back-References (Show Where Each Source Is Cited)

Enable back-references so the bibliography shows which pages cite each entry:

% With biblatex:
\usepackage[backend=biber, backref=true]{biblatex}

% With natbib + hyperref:
\usepackage[pagebackref=true]{hyperref}

% Result in bibliography:
% [1] Smith, J. Deep Learning... (cited on pp. 3, 7, 15)

💡 Tips

•Never create duplicate .bib entries for the same source — use the same key
•natbib's \citeauthor{} and \citeyear{} let you reference parts: 'Smith (2024)'
•Back-references are especially helpful for reviewers checking your citations
•Bibby AI's citation features help manage repeated citations automatically

Try This in Bibby AI

Write LaTeX faster with AI auto-complete and instant compilation.

Start Writing Free