Which Bibliographic Style – APS, MLA, or Chicago?: As a writer/photographer in private practice, I specialize in nonfiction for adult and younger readers in both the U.S. and overseas (English-speaking) markets. I cover popularized science (mostly earth sciences), environmental, maritime, geographical, historical, biographical and safety themes … plus general essays and human interest. Regarding bibliographies, should I adhere to the APA, MLA, or Chicago style? Thanks.