Παραπομπή APA

Johansen, D. A. (1990). Plant embryology. Bishen Singh, Mahendrapal Singh.

Παραπομπή Chicago Style

Johansen, Donald Alexander. Plant Embryology. Dehradun: Bishen Singh, Mahendrapal Singh, 1990.

Παραπομπή MLA

Johansen, Donald Alexander. Plant Embryology. Bishen Singh, Mahendrapal Singh, 1990.