Engelman, R., & LeRoy, P. (1993). Sustaining water: Population and the future of renewable water supplies. Washington: Population Action International.
Citazione stile Chigago Style (17a edizione)Engelman, Robert, e Pamela LeRoy. Sustaining Water: Population and the Future of Renewable Water Supplies. Washington: Population Action International, 1993.
Citatione MLA (8a ed.)Engelman, Robert, e Pamela LeRoy. Sustaining Water: Population and the Future of Renewable Water Supplies. Washington: Population Action International, 1993.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.