Chicago/Turabian is the student version of The Chicago Manual of Style.
The main differences between the two is Chicago/Turbabian is intended for student papers that will not be published and includes formatting guidelines. Authors of professional papers that will be published do not included formatting requirements, rather the paper is formatted according to the guidelines of each publisher. Both the student and the professional versions are considered "official" Chicago Style.
Citations in Chicago/Turabian style come in two forms:
(1) notes and bibliography (or simply notes)
(2) author-date
Database Citations
Be aware that if you copy/paste a citation from a database, some citations in database contain errors, most often with incorrect capitalization. And sometimes when you past your citation into your paper, the italics revert to regular format. Double-check your citation against a style guide. Your job as the author of your work is to make the corrections before you turn them in.