Webb, L. J. (1977). Ecological considerations and safeguards in the modern use of tropical lowland rain forests as a source of pulpwood: Example, the Madang Area P.N.G. Office of Environment and Conservation, Department of Natural Resources, Papua New Guinea.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Webb, Leonard J. Ecological Considerations and Safeguards in the Modern Use of Tropical Lowland Rain Forests as a Source of Pulpwood: Example, the Madang Area P.N.G. [s.l.]: Office of Environment and Conservation, Department of Natural Resources, Papua New Guinea, 1977.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Webb, Leonard J. Ecological Considerations and Safeguards in the Modern Use of Tropical Lowland Rain Forests as a Source of Pulpwood: Example, the Madang Area P.N.G. Office of Environment and Conservation, Department of Natural Resources, Papua New Guinea, 1977.