Cita APA (7a ed.)

Smith, R. E. (1941). Diseases of field crops. California agricultural extension service.

Cita Chicago Style (17a ed.)

Smith, Ralph E. Diseases of Field Crops. Berkeley: California agricultural extension service, 1941.

Cita MLA (8a ed.)

Smith, Ralph E. Diseases of Field Crops. California agricultural extension service, 1941.