Other
Punctuation Mark Rules: The Apostrophe
An informational site detailing some of the uses and misuses of the "apostrophe" in English punctuation. Also includes several examples.
Other
Sandhills Community College: The Apostrophe
A valuable resource for learning about the uses of the apostrophe in English punctuation, including apostrophes with possessive nouns as well as contractions. Provides examples.
ACT360 Media
Writing Tips: Sentence Builder: Apostrophe
A brief description of the rules, usage, and examples of the "apostrophe" in English punctuation.