Cita APA (7a ed.)

Bell, A. D., & Bryan, A. (1991). Plant form: An illustrated guide to flowering plant morphology. Oxford University Press.

Cita Chicago Style (17a ed.)

Bell, Adrian D., y Alan Bryan. Plant Form: An Illustrated Guide to Flowering Plant Morphology. Oxford: Oxford University Press, 1991.

Cita MLA (8a ed.)

Bell, Adrian D., y Alan Bryan. Plant Form: An Illustrated Guide to Flowering Plant Morphology. Oxford University Press, 1991.