Cita APA

Briggs, D., & Walters, S. M. (1972). Plant variation and evolution. New York: McGraw-Hill.

Citación estilo Chicago

Briggs, D., y S. M. Walters. Plant Variation and Evolution. New York: McGraw-Hill, 1972.

Cita MLA

Briggs, D., y S. M. Walters. Plant Variation and Evolution. New York: McGraw-Hill, 1972.