Citazione Stile APA (7a Edizione)

Papua New Guinea, Geological Survey of Papua New Guinea, & George, J. E. (1978). Hydrogeological investigations 1977. Office of Minerals and Energy.

Citazione stile Chigago Style (17a edizione)

Papua New Guinea, Geological Survey of Papua New Guinea, e J. E. George. Hydrogeological Investigations 1977. [Port Moresby]: Office of Minerals and Energy, 1978.

Citatione MLA (9a ed.)

Papua New Guinea, et al. Hydrogeological Investigations 1977. Office of Minerals and Energy, 1978.