Cita APA (7th ed.)
Hargreaves, D., & Hargreaves, B. (1972). African trees. Hargreaves Co..
Cita Chicago (17th ed.)
Hargreaves, Dorothy, i Bob Hargreaves. African Trees. Hawai: Hargreaves Co., 1972.
Cita MLA (9th ed.)
Hargreaves, Dorothy, i Bob Hargreaves. African Trees. Hargreaves Co., 1972.
Atenció: Aquestes cites poden no estar 100% correctes.