Ray, P. M. (1983). Botany. Saunders College Publishing.
Cita Chicago (17th ed.)Ray, Peter Martin. Botany. Saunders College Publishing, 1983.
Cita MLA (9th ed.)Ray, Peter Martin. Botany. Saunders College Publishing, 1983.
Atenció: Aquestes cites poden no estar 100% correctes.