APA aipamena

Engelman, R., & LeRoy, P. (1993). Sustaining water: Population and the future of renewable water supplies. Washington: Population Action International.

Chicago Style aipamena

Engelman, Robert, and Pamela LeRoy. Sustaining Water: Population and the Future of Renewable Water Supplies. Washington: Population Action International, 1993.

MLA aipamena

Engelman, Robert, and Pamela LeRoy. Sustaining Water: Population and the Future of Renewable Water Supplies. Washington: Population Action International, 1993.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.