Citation, Documentation of Sources
Q. Should footnotes and bibliographic entries for foreign publications be written in the foreign language or in English?
A. Use the original language for the book title. You may transliterate languages that have non-Latin alphabets, and you may also provide an English translation of the title in brackets [Like this: Sentence-capped and roman], if you think it will be helpful to readers. The place of publication should be given in English, and if you are certain of the correct translation, you may render terms like vol. and ser. in English. Please see CMOS 14.99 and 14.202.