Leorard, W. H., Martin, J. H., & Stamp, D. L. (1975). Principles of field crop production (Ed.3.).
Chicago Edition CitationLeorard, Warren H., John H. Martin, and David L. Stamp. Principles of Field Crop Production. Ed.3. New York, Macmillan, 1975.
MLA Edition CitationLeorard, Warren H., et al. Principles of Field Crop Production. Ed.3. 1975.
Advarsel: Disse citationer er muligvist ikke 100% nøjagtige.