When using beamer slides and a bibliography that automatically creates references at the end (i.e. on the last slide) of your presentation, not all references will be shown. Instead, references that do not fit on the slide will be truncated. Depending on your font size that means if you have more than four to six references, not all references are included. To prevent this unfortunate behavior, add {.allowframebreaks} to the title of the last slide:

# References {.allowframebreaks}

here be citations

Unfortunately, this is not enough. To allow reasonable slide breaks between citations you also need to add the following to your YAML header:

header-includes:
  - \widowpenalties 1 150

An additional trick: to indent citations in APA (6th) style use

# References {.allowframebreaks}

\setlength{\parindent}{-0.5in}
\setlength{\leftskip}{0.5in}
\setlength{\parskip}{8pt}

 

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