Caldwell, L. K. (1972). In defense of earth: International protection of the biosphere. Indiana University Press.
Citazione stile Chigago Style (17a edizione)Caldwell, Lynton K. In Defense of Earth: International Protection of the Biosphere. London: Indiana University Press, 1972.
Citatione MLA (9a ed.)Caldwell, Lynton K. In Defense of Earth: International Protection of the Biosphere. Indiana University Press, 1972.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.