Παραπομπή σε μορφή APA (7η εκδ.)

Gunatilake, H. (2006). Willingness-to-pay and design of water supply and sanitation projects: A case study. Asian Development Bank.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Gunatilake, Herath. Willingness-to-pay and Design of Water Supply and Sanitation Projects: A Case Study. [Mandaluyong City]: Asian Development Bank, 2006.

Παραπομπή σε μορφή MLA (9th εκδ.)

Gunatilake, Herath. Willingness-to-pay and Design of Water Supply and Sanitation Projects: A Case Study. Asian Development Bank, 2006.