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Why would two bibliography entries display their title in different formats? For no apparent reason I get one title in double quotes and one title in italics .

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This is in a \documentclass{book} I have a .bib collection with @techreport and @article entries.

Compiling with current versions LaTeX, LuaLaTeX or XeLaTeX biblatex and biber or BibTeX, so overall, I assume I overlook a fundamental difference in how these to reference classes are handled. Could someone point me to the right region?

Jona Engel
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  • Have a look at https://tex.stackexchange.com/q/464279/35864 and the links in the answer there. – moewe Jan 27 '22 at 06:11
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    Note that the bold bibstrings (like "and" and "october") suggest that your document language is not supported by biblatex. You may want to look into making biblatex support your language (https://tex.stackexchange.com/q/200932/35864) or switching the bibliography to a supported language. – moewe Jan 27 '22 at 16:27
  • That's, right. I simply did not have any language set but used \babel and \csquotes. – Jona Engel Jan 28 '22 at 02:38

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As pointed out in the comments by @moewe, the bold strings in the bibliography indicate a missing or unsupported language. In my case the language was nil as I did not set any but still used the babel and the csquotes package. Setting a language resolved my issue.

Jona Engel
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    The language settings (or their absence) should not have an effect on whether or not titles are formatted in italics or quotation marks. So while the language issues is very relevant, it is not directly related to the question apparently asked in the title of the question or the question body. Maybe you want to edit your question (or your answer) so that answer and question match. This makes this Q&A much more relevant for future visitors of the site. – moewe Jan 28 '22 at 10:56