For HELP citing sources according to the Chicago Manual of Style Guidelines, look to these resources in print or online:
The Chicago Manual of Style, 16th ed. -- Available for 2-hour check-out at the Check-Out Desk
Coming in September ... The Chicago Manual of Style, 17th Edition
The 17th edition will be published in September 2017. (Copies currently on order.)
During the transition, ask your professor if you should use 16th or 17th edition.