APA-referens (7:e uppl.)

Parker, H. (1887). Report on the Per-Aru Valley: Irrigation in the Northern Province, Mullaittivu District. George J.A. Skeen, Govt. Printer, Ceylon.

Chicago-referens (17:e uppl.)

Parker, Henry. Report on the Per-Aru Valley: Irrigation in the Northern Province, Mullaittivu District. Colombo: George J.A. Skeen, Govt. Printer, Ceylon, 1887.

MLA-referens (8:e uppl.)

Parker, Henry. Report on the Per-Aru Valley: Irrigation in the Northern Province, Mullaittivu District. George J.A. Skeen, Govt. Printer, Ceylon, 1887.