APA-referens (7:e uppl.)

Wickramasekara, P. (1993). Tonga: Rural employment and development. ILO-ARTEP.

Chicago-referens (17:e uppl.)

Wickramasekara, Piyasiri. Tonga: Rural Employment and Development. New Delhi: ILO-ARTEP, 1993.

MLA-referens (8:e uppl.)

Wickramasekara, Piyasiri. Tonga: Rural Employment and Development. ILO-ARTEP, 1993.