The APA Style website provides online guidelines for commonly asked questions concerning electronic references. It is an auxiliary companion to the APA reference book, The Publication Manual of the American Psychological Association.

This classic style guide from William Strunk, Jr. gives the principal requirements of plain English style and concentrates attention on the rules of usage and principles of composition most commonly violated.

The English Department at the University of Calgary provides this tutorial on grammar, covering parts of speech, sentence elements, punctuation, and word use. It includes a section on marking, and links to related resources.

This website contains links to various sections of the online tutorial Guide to Grammar and Writing, which is sponsored by the Capital Community College Foundation.

The American Heritage® Book of English Usage is a detailed look at grammar, style, diction, word formation, gender, social groups and scientific forms. It is a valuable reference work for students, writers, academicians and anybody concerned about proper writing style.