APA
Fehr W. R., . (1984). Genetic contributions to yield gains of five major crop plants. America: America Society of Agronomy.
Chicago
Fehr W R, . 1984. Genetic contributions to yield gains of five major crop plants. America: America Society of Agronomy.
Harvard
Fehr W. R., . (1984). Genetic contributions to yield gains of five major crop plants. America: America Society of Agronomy.
MLA
Fehr W R, . Genetic contributions to yield gains of five major crop plants. America: America Society of Agronomy. 1984.