APA-referens (7:e uppl.)

Lebbe, I. (1982). North West Land & Water Resources Development Project: Vanathavillu socio-economic study. Agrarian Research & Training Institute.

Chicago-referens (17:e uppl.)

Lebbe, Ishak. North West Land & Water Resources Development Project: Vanathavillu Socio-economic Study. Colombo: Agrarian Research & Training Institute, 1982.

MLA-referens (8:e uppl.)

Lebbe, Ishak. North West Land & Water Resources Development Project: Vanathavillu Socio-economic Study. Agrarian Research & Training Institute, 1982.