Cita APA (7th ed.)

Papua New Guinea & United Nations Environment Programme. (1986). Environmental management in Papua New Guinea. [s.n.].

Cita Chicago (17th ed.)

Papua New Guinea i United Nations Environment Programme. Environmental Management in Papua New Guinea. [S.l.]: [s.n.], 1986.

Cita MLA (8th ed.)

Papua New Guinea i United Nations Environment Programme. Environmental Management in Papua New Guinea. [s.n.], 1986.