Style de citation APA (7e éd.)

Humphreys, G. S. (1984). The environment and soils of Chimbu Province, Papua New Guinea, with particular reference to soil erosion. Dept. of Primary Industry.

Style de citation Chicago (17e éd.)

Humphreys, G. S. The Environment and Soils of Chimbu Province, Papua New Guinea, with Particular Reference to Soil Erosion. Port Moresby: Dept. of Primary Industry, 1984.

Style de citation MLA (9e éd.)

Humphreys, G. S. The Environment and Soils of Chimbu Province, Papua New Guinea, with Particular Reference to Soil Erosion. Dept. of Primary Industry, 1984.