APA (7th ed.) Citation

Stewart, D. M., & Roberts, B. J. (1970). Identyfying races of Puccinia graminis F.sp. avenae: A modified international system. U.S. Dep. of Agriculture.

Chicago Style (17th ed.) Citation

Stewart, D. M., and B. J. Roberts. Identyfying Races of Puccinia Graminis F.sp. Avenae: A Modified International System. Washington, D.C: U.S. Dep. of Agriculture, 1970.

MLA (9th ed.) Citation

Stewart, D. M., and B. J. Roberts. Identyfying Races of Puccinia Graminis F.sp. Avenae: A Modified International System. U.S. Dep. of Agriculture, 1970.