Beets, W. C. (1982). Multiple cropping and tropical farming systems. Gower Pub.
Lua i Stíl Chicago (17ú heag.)Beets, Willem C. Multiple Cropping and Tropical Farming Systems. England: Gower Pub, 1982.
Lua MLA (9ú heag.)Beets, Willem C. Multiple Cropping and Tropical Farming Systems. Gower Pub, 1982.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.