Bleeker, P., & Healy, P. A. (1980). Analytical data of Papua New Guinea soils. Commonwealth Scientific and Industrial Research Organization, Australia.
Lua i Stíl Chicago (17ú heag.)Bleeker, P., agus P. A. Healy. Analytical Data of Papua New Guinea Soils. Melbourne: Commonwealth Scientific and Industrial Research Organization, Australia, 1980.
Lua MLA (8ú heag.)Bleeker, P., agus P. A. Healy. Analytical Data of Papua New Guinea Soils. Commonwealth Scientific and Industrial Research Organization, Australia, 1980.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.