Pushparajah. (1982). The oil palm in agriculture in the eighties volume I. The Incorporated Society of Planters.
Lua i Stíl Chicago (17ú heag.)Pushparajah. The Oil Palm in Agriculture in the Eighties Volume I. The Incorporated Society of Planters, 1982.
Lua MLA (8ú heag.)Pushparajah. The Oil Palm in Agriculture in the Eighties Volume I. The Incorporated Society of Planters, 1982.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.