Παραπομπή σε μορφή APA (7η εκδ.)

Groot, B. d. (1961). Libido and semen characteristics of bull twins with special regard to genotypic and environmental variability. G. van Dijk.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Groot, Bram de. Libido and Semen Characteristics of Bull Twins with Special Regard to Genotypic and Environmental Variability. Breukelen: G. van Dijk, 1961.

Παραπομπή σε μορφή MLA (8th εκδ.)

Groot, Bram de. Libido and Semen Characteristics of Bull Twins with Special Regard to Genotypic and Environmental Variability. G. van Dijk, 1961.