Cita APA (7th ed.)

Rogers, M. N., & Tjia, B. O. S. (1990). Gerbera production for cut flowers and pot plants. Timber.

Cita Chicago (17th ed.)

Rogers, Marlin N., i Benny Oen Swie Tjia. Gerbera Production for Cut Flowers and Pot Plants. Portland: Timber, 1990.

Cita MLA (9th ed.)

Rogers, Marlin N., i Benny Oen Swie Tjia. Gerbera Production for Cut Flowers and Pot Plants. Timber, 1990.