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Sophia Learning
Sophia: Common Issues With Apostrophes: Lesson 3
This lesson explores common errors made with apostrophes and how to correct them. It is 3 of 3 in the series titled "Common Issues with Apostrophes."
Grammarly
Grammarly Blog: Apostrophe Rules
This page focuses on the rules for the uses and misuses of the apostrophe including contractions and omissions, possessive nouns, possessive pronouns, how to write joint possession, plurals, apostrophes with surrounding punctuation, and...
Other
Possessives
This article contains rules about the correct way to incorporate possessives into college writing. A link with downloadable practice exercises is included at the end of the lesson.
SUNY Empire State College
Empire State College: Apostrophes
This resource looks at the three main uses of apostrophes: to take the place of deleted letters; to show possession; and to show plurals of letters, numbers, symbols, abbreviations and words used as words.
Online Writing Lab at Purdue University
Purdue University Owl: Possessive Pronoun and Apostrophe
This Purdue Online Writing Lab article explains the three uses of the apostrophe.