APA

Internacional Conference on Crop Productivity-Research Imperatives, Brown A. W. a., Byerly T. C., Gibbs M. & San Pietro A. (1975). Crop productivity. Research imperatives. Michigan: Michigan Agricultural Experiment Station; Foundation Kettering.

Chicago

Internacional Conference on Crop Productivity-Research Imperatives, Brown A W a, Byerly T C, Gibbs M and San Pietro A. 1975. Crop productivity. Research imperatives. Michigan: Michigan Agricultural Experiment Station; Foundation Kettering.

Harvard

Internacional Conference on Crop Productivity-Research Imperatives, Brown A. W. a., Byerly T. C., Gibbs M. and San Pietro A. (1975). Crop productivity. Research imperatives. Michigan: Michigan Agricultural Experiment Station; Foundation Kettering.

MLA

Internacional Conference on Crop Productivity-Research Imperatives, Brown A W a, Byerly T C, Gibbs M and San Pietro A. Crop productivity. Research imperatives. Michigan: Michigan Agricultural Experiment Station; Foundation Kettering. 1975.