Cita APA (7th ed.)
Walvoord, B. E. (1988). Three steps to revising your writing for style, grammar, punctuation, and spelling. Scott. Foresman and Co..
Cita Chicago (17th ed.)
Walvoord, Barbara E. Three Steps to Revising Your Writing for Style, Grammar, Punctuation, and Spelling. Clenview, Illinois: Scott. Foresman and Co., 1988.
Cita MLA (9th ed.)
Walvoord, Barbara E. Three Steps to Revising Your Writing for Style, Grammar, Punctuation, and Spelling. Scott. Foresman and Co., 1988.
Atenció: Aquestes cites poden no estar 100% correctes.