Cita APA (7a ed.)

Bell, C. R., & Cavanagh, S. C. S. (1967). Plant variation and classification. Macmillan.

Cita Chicago Style (17a ed.)

Bell, C. Ritchie, y Susan Carlton Smith Cavanagh. Plant Variation and Classification. London: Macmillan, 1967.

Cita MLA (9a ed.)

Bell, C. Ritchie, y Susan Carlton Smith Cavanagh. Plant Variation and Classification. Macmillan, 1967.