APA (7th ed.) Citation

Martin, J. H., & Leonard, W. H. (1949). Principles of field crop production. The Macmillan company.

Chicago Style (17th ed.) Citation

Martin, John H., and Warren H. Leonard. Principles of Field Crop Production. New York: The Macmillan company, 1949.

MLA (8th ed.) Citation

Martin, John H., and Warren H. Leonard. Principles of Field Crop Production. The Macmillan company, 1949.