Colvin, C., & Stevenson, J. A. (1922). Farm projects: A textbook in agriculture for seventh and eighth grades and junior high schools. The Macmillan Company.
Citace podle Chicago (17th ed.)Colvin, Carl, a John A. Stevenson. Farm Projects: A Textbook in Agriculture for Seventh and Eighth Grades and Junior High Schools. New York: The Macmillan Company, 1922.
Citace podle MLA (8th ed.)Colvin, Carl, a John A. Stevenson. Farm Projects: A Textbook in Agriculture for Seventh and Eighth Grades and Junior High Schools. The Macmillan Company, 1922.
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