APA (7th ed.) Citation

Johns, R. J. (2002). Vegetation zones of New Guinea. Royal Botanic Gardens [u.a.].

Chicago Style (17th ed.) Citation

Johns, Robert J. Vegetation Zones of New Guinea. Kew: Royal Botanic Gardens [u.a.], 2002.

MLA (9th ed.) Citation

Johns, Robert J. Vegetation Zones of New Guinea. Royal Botanic Gardens [u.a.], 2002.