APA (7th ed.) Citation

Hopt, E., & Spafford, R. R. (1914). Laboratory exercises in principles of agriculture. W.M. Welch Manufacturing Company.

Chicago Style (17th ed.) Citation

Hopt, Erwin, and Russell R. Spafford. Laboratory Exercises in Principles of Agriculture. Chicago, Ill.: W.M. Welch Manufacturing Company, 1914.

MLA (9th ed.) Citation

Hopt, Erwin, and Russell R. Spafford. Laboratory Exercises in Principles of Agriculture. W.M. Welch Manufacturing Company, 1914.