Yarbro, S., & Noble, S. (1989). Smallholder production, processing and marketing of cocoa and copra in Papua New Guinea: A baseline survey. Australian National University].
Lua i Stíl Chicago (17ú heag.)Yarbro, Scott, agus Stewart Noble. Smallholder Production, Processing and Marketing of Cocoa and Copra in Papua New Guinea: A Baseline Survey. [Canberra: Australian National University], 1989.
Lua MLA (9ú heag.)Yarbro, Scott, agus Stewart Noble. Smallholder Production, Processing and Marketing of Cocoa and Copra in Papua New Guinea: A Baseline Survey. Australian National University], 1989.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.