Garvey, G. (1972). Energy, ecology, economy ([1st ed.].). Norton.
Cita Chicago (17th ed.)Garvey, Gerald. Energy, Ecology, Economy. [1st ed.]. New York: Norton, 1972.
Cita MLA (8th ed.)Garvey, Gerald. Energy, Ecology, Economy. [1st ed.]. Norton, 1972.
Atenció: Aquestes cites poden no estar 100% correctes.