Παραπομπή σε μορφή APA (7η εκδ.)

Walsh, B. J., & Sombo, Z. (1986). Mapping your future: An introduction to surveying, cartography and land management at the Papua New Guinea University of Technology. Dept. of Surveying and Land Management, PNG University of Technology.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Walsh, B. J., και Z. Sombo. Mapping Your Future: An Introduction to Surveying, Cartography and Land Management at the Papua New Guinea University of Technology. Lae: Dept. of Surveying and Land Management, PNG University of Technology, 1986.

Παραπομπή σε μορφή MLA (9th εκδ.)

Walsh, B. J., και Z. Sombo. Mapping Your Future: An Introduction to Surveying, Cartography and Land Management at the Papua New Guinea University of Technology. Dept. of Surveying and Land Management, PNG University of Technology, 1986.