A manual for writers of research papers, theses, and dissertations, Ninth edition - Kate L. Turabian 2018

Apostrophes
Punctuation
Style

For the use of apostrophes in plural and possessive forms, see 20.1 and 20.2. Apostrophes are also used in forming contractions (don’t). If your word processor is enabled to use directional or “smart” quotation marks, make sure not to confuse an apostrophe for a left single quotation mark (’twas, not ’twas).