APA (7th ed.) Citation

Colwell, C. C., & Knox, J. H. (1973). What's the usage?: The writer's guide to English grammar and rhetoric. Reston Pub. Co.

Chicago Style (17th ed.) Citation

Colwell, C. Carter, and James H. Knox. What's the Usage?: The Writer's Guide to English Grammar and Rhetoric. Reston, Va: Reston Pub. Co, 1973.

MLA (9th ed.) Citation

Colwell, C. Carter, and James H. Knox. What's the Usage?: The Writer's Guide to English Grammar and Rhetoric. Reston Pub. Co, 1973.