Citazione Stile APA (7a Edizione)

Sonoling, V. (1988). Agroforestry farming systems in Bulolo valley, Morobe Province, Papua New Guinea. Environment and Policy Institute, East-West Centre.

Citazione stile Chigago Style (17a edizione)

Sonoling, Vida. Agroforestry Farming Systems in Bulolo Valley, Morobe Province, Papua New Guinea. Honolulu: Environment and Policy Institute, East-West Centre, 1988.

Citatione MLA (9a ed.)

Sonoling, Vida. Agroforestry Farming Systems in Bulolo Valley, Morobe Province, Papua New Guinea. Environment and Policy Institute, East-West Centre, 1988.