Van der Maas, H. M. (1994). Towards in vitro fertilization, gametosomatic cybridization and DNA transfer in perennial ryegrass (Lolium perenne L.). [s.n.].
Chicago-referens (17:e uppl.)Van der Maas, Heleen M. Towards in Vitro Fertilization, Gametosomatic Cybridization and DNA Transfer in Perennial Ryegrass (Lolium Perenne L.). Wageningen: [s.n.], 1994.
MLA-referens (8:e uppl.)Van der Maas, Heleen M. Towards in Vitro Fertilization, Gametosomatic Cybridization and DNA Transfer in Perennial Ryegrass (Lolium Perenne L.). [s.n.], 1994.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.