Παραπομπή σε μορφή APA (7η εκδ.)

Van der Maas, H. M. (1994). Towards in vitro fertilization, gametosomatic cybridization and DNA transfer in perennial ryegrass (Lolium perenne L.). [s.n.].

Παραπομπή σε μορφή Chicago (17η εκδ.)

Van der Maas, Heleen M. Towards in Vitro Fertilization, Gametosomatic Cybridization and DNA Transfer in Perennial Ryegrass (Lolium Perenne L.). Wageningen: [s.n.], 1994.

Παραπομπή σε μορφή MLA (8th εκδ.)

Van der Maas, Heleen M. Towards in Vitro Fertilization, Gametosomatic Cybridization and DNA Transfer in Perennial Ryegrass (Lolium Perenne L.). [s.n.], 1994.