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I have a rather complex document using the biblatex style apa. For some sources that I cite first names appear (which I don't want, according to the APA guidelines), such as in:

\autocite{windttheoryconsciousness}

which yields

(Jennifer M. Windt & Noreika, 2011)

However

\autocite{stumbrysinductionreview}

yields

(Stumbrys, Erlacher, Schädlich, & Schredl, 2012)

These are the entries in the .bib file:

@article{windttheoryconsciousness,
title={How to integrate dreaming into a general theory of consciousness—a critical review of existing positions and suggestions for future research},
author={Jennifer M. Windt and Valdas Noreika},
journal={Consciousness and cognition},
volume={20},
number={4},
pages={1091--1107},
year=2011,
publisher={Elsevier}
}

@article{stumbrysinductionreview,
title={Induction of lucid dreams: A systematic review of evidence},
author={Tadas Stumbrys and Daniel Erlacher and Melanie Sch{\"a}dlich and Michael Schredl},
journal={Consciousness and Cognition},
volume={21},
number={3},
pages={1456--1475},
year=2012,
publisher={Elsevier}
}

I tried a minimal example, but I could not reproduce the problem (which was that first names sometimes appear and sometimes not). Therefore I can phrase my question only vaguely: What could be the difference between these sources? I noticed that sometimes the year tag was in curly brackets, but I removed them and recompiled -- still the same result in the complex document. Also, for some sources in the bib file I noticed that authors were separated by commas instead of and. Changed that and recompiled -- still the same. Both of these sources appeared for the first time in the document.

I'd appreciate any guide in solving this problem.

4

1 Answer 1

16

If two different authors have the same surname, biblatex adds the first name to identify each of them. (You may add the uniquename=false option to change this behavior.)

Ex:

\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{lmodern}
\usepackage{filecontents}
\begin{filecontents*}{\jobname.bib}
@article{windttheoryconsciousness,
title={How to integrate dreaming into a general theory of consciousness—a critical review of existing positions and suggestions for future research},
author={Jennifer M. Windt and Valdas Noreika},
journal={Consciousness and cognition},
volume={20},
number={4},
pages={1091--1107},
year=2011,
publisher={Elsevier}
}

@article{windttheoryconsciousness2,
title={How to integrate dreaming into a general theory of consciousness—a critical review of existing positions and suggestions for future research},
author={Alex Windt and Valdas Noreika},
journal={Consciousness and cognition},
volume={20},
number={4},
pages={1091--1107},
year=2011,
publisher={Elsevier}
}

@article{stumbrysinductionreview,
title={Induction of lucid dreams: A systematic review of evidence},
author={Tadas Stumbrys and Daniel Erlacher and Melanie Sch{\"a}dlich and Michael Schredl},
journal={Consciousness and Cognition},
volume={21},
number={3},
pages={1456--1475},
year=2012,
publisher={Elsevier}
}
\end{filecontents*}

\usepackage[american]{babel}
\usepackage{csquotes}
\usepackage[style=apa,backend=biber]{biblatex}
\DeclareLanguageMapping{american}{american-apa}

\addbibresource{\jobname.bib}
\begin{document}
\autocite{windttheoryconsciousness}
\autocite{windttheoryconsciousness2}
\autocite{stumbrysinductionreview}

\printbibliography
\end{document}

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