Cita APA (7th ed.)

Ellen, R. (1982). Environment, subsistence and system: The ecology of small-scale social formations. U. Pr..

Cita Chicago (17th ed.)

Ellen, Roy. Environment, Subsistence and System: The Ecology of Small-scale Social Formations. Cambridge: U. Pr., 1982.

Cita MLA (9th ed.)

Ellen, Roy. Environment, Subsistence and System: The Ecology of Small-scale Social Formations. U. Pr., 1982.