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@unpublished{t1,
  title = {A Manuscript: 2014-12-31/2015-01-01},
  author = {Doe, John},
  date = {2014-12-31/2015-01-01},
  origdate = {1777-07-27/1888-08-28},
  eventdate = {1888-08-28},
  urldate = {2014-12-31~}
}

@book{t2,

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    <bib:Document rdf:about="#item_34383">
        <z:itemType>webpage</z:itemType>
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<?xml version="1.0" encoding="utf-8"?>
<style xmlns="http://purl.org/net/xbiblio/csl" class="in-text" version="1.0" demote-non-dropping-particle="display-and-sort" page-range-format="chicago">
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      <name>Julian Onions</name>
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<?xml version="1.0" encoding="utf-8"?>
<style xmlns="http://purl.org/net/xbiblio/csl" class="in-text" version="1.0" demote-non-dropping-particle="display-and-sort" page-range-format="chicago">

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    <link href="https://gist.github.com/njbart/116c190af4f3dca7ed800324aed0380f/raw/d13fc9ef60e10b06f3d7fda3bf78399f12553926/chicago-author-date-enhanced-20090102.csl" rel="self" />
    <link href="http://www.chicagomanualofstyle.org/tools_citationguide.html" rel="documentation" />
    <author>
      <name>Julian Onions</name>

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Intro / General

rmarkdown and bookdown offer two different methods for managing citations and bibliographic references in a document.

The default setting for rmarkdown and bookdown (and pandoc itself) is to use a pandoc helper program (specifically, a “filter”) called pandoc-citeproc, which follows the specifications of the Citation Style Language (CSL) and obtains specific formatting instructions from one of the huge number of available CSL style files (default is chicago-author-date.csl).

In some circumstances, users might prefer to use either natbib (based on bibtex) or biblatex as a “citation package” instead.