APA (7th ed.) Citation

Martin, J. H., & Leonard, W. H. (1969). Principles of field crop production (2. ed.). MacMillan.

Chicago Style (17th ed.) Citation

Martin, John H., and Warren H. Leonard. Principles of Field Crop Production. 2. ed. London: MacMillan, 1969.

MLA (9th ed.) Citation

Martin, John H., and Warren H. Leonard. Principles of Field Crop Production. 2. ed. MacMillan, 1969.