Shepard, P., & McKinley, D. (1971). Environmental essays on the planet as home. Houghton-Mifflin.
Citace podle Chicago (17th ed.)Shepard, Paul, a Daniel McKinley. Environmental Essays on the Planet as Home. Boston: Houghton-Mifflin, 1971.
Citace podle MLA (9th ed.)Shepard, Paul, a Daniel McKinley. Environmental Essays on the Planet as Home. Houghton-Mifflin, 1971.
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