Παραπομπή σε μορφή APA (7η εκδ.)

Hofkes, E. H., & Visscher, J. T. (1986). Renewable energy sources for rural water supply. International Reference Centre for Community Water Supply and Sanitation.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Hofkes, E. H., και J. T. Visscher. Renewable Energy Sources for Rural Water Supply. The Hague: International Reference Centre for Community Water Supply and Sanitation, 1986.

Παραπομπή σε μορφή MLA (9th εκδ.)

Hofkes, E. H., και J. T. Visscher. Renewable Energy Sources for Rural Water Supply. International Reference Centre for Community Water Supply and Sanitation, 1986.