Guasti, C. A. (2001). Earth: An oasis of life. Reader's Digest.
Lua i Stíl Chicago (17ú heag.)Guasti, Carol A. Earth: An Oasis of Life. Pleasantville: Reader's Digest, 2001.
Lua MLA (9ú heag.)Guasti, Carol A. Earth: An Oasis of Life. Reader's Digest, 2001.
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