Purdue's Online Writing Lab commonly referred to as Purdue OWL is an online resource that supplements Purdue's writing lab. Over time it has become a go-to resource for faculty and students alike. If getting to Vogel to check out the Chicago Manual of Style can't happen, Purdue OWL is a wonderful online resource to use for your citation needs.
CAUTION: In early 2019, Purdue OWL began a partnership with Chegg, which introduced a Citation Machine widget to their otherwise wonderful content. Do not be tempted by these citation generators. Scroll past them to the documentation below, while you will have to do the critical thinking to model after the examples, you are more likely to create a correct and complete citation this way.