Cita APA (7a ed.)

Nichols, J. (1957). Livestock improvement in relation to heredity and environment (4th edition.). Iowa State College Press.

Cita Chicago Style (17a ed.)

Nichols, J.E. Livestock Improvement in Relation to Heredity and Environment. 4th edition. Ames: Iowa State College Press, 1957.

Cita MLA (8a ed.)

Nichols, J.E. Livestock Improvement in Relation to Heredity and Environment. 4th edition. Iowa State College Press, 1957.