APA (7th ed.) Citation

Papua New Guinea. Dept. of Primary Industry. (1977). Looking after the soil (Rev. ed.). Dept. of Primary Industry.

Chicago Style (17th ed.) Citation

Papua New Guinea. Dept. of Primary Industry. Looking After the Soil. Rev. ed. Port Moresby: Dept. of Primary Industry, 1977.

MLA (9th ed.) Citation

Papua New Guinea. Dept. of Primary Industry. Looking After the Soil. Rev. ed. Dept. of Primary Industry, 1977.