APA (7th ed.) Citation

American Society of Agronomy, Crop Science Society of America, Fehr, W. R., & Hadley, H. H. 1. . .. Hybridization of crop plants.

Chicago Style (17th ed.) Citation

American Society of Agronomy, Crop Science Society of America, W. R. Fehr, and Henry Hultman 1917- Hadley. Hybridization of Crop Plants.

MLA (9th ed.) Citation

American Society of Agronomy, et al. Hybridization of Crop Plants.