Papua New Guinea & United Nations Environment Programme. (1986). Environmental management in Papua New Guinea. [s.n.].
Chicagoスタイル(17版)引用形式Papua New Guinea , United Nations Environment Programme. Environmental Management in Papua New Guinea. [S.l.]: [s.n.], 1986.
MLA(8版)引用形式Papua New Guinea , United Nations Environment Programme. Environmental Management in Papua New Guinea. [s.n.], 1986.
警告: この引用は必ずしも正確ではありません.