Citing Primary Sources: Chicago Style- Library of Congress always has great resources for students and this one tops the list of citation help. It has different examples and also gives a brief explanation of how to cite any material you may find on the internet.
Citation Examples from The Ohio State University Libraries Guide- This guide has a multitude of examples that may assist you with books you might access electronically as well as any other type of material you may find on the Web that your handy Chicago style manual may not provide for during your research experience.
Purdue OWL Writing Guide- There is a reason why this is constantly referenced all the time by librarians and professors alike and it is because it is a very well-laid out guide on how to handle your citations.