OWL (Online Writing Law) at Purdue University. This site Includes a downloadable sample paper illustrating format and Chicago citation style. Make sure you choose the format that is required by your professor, either Notes and Bibliography or Author - Date.
This link will take you to Centennial College Libraries MLA style guide..
Citing Using Library Databases
Most Library databases provide citation tools to reference articles, books and other resources in several different styles. Make sure you choose the style your professors require you to use.
The Chicago Manual of Style, 17th edition