APA Alıntı

Joseph Wood Krutch. (1968). Grand Canyon: Today and its yesterday. New York: Apollo.

Chicago Stili Alıntı

Joseph Wood Krutch. Grand Canyon: Today and Its Yesterday. New York: Apollo, 1968.

MLA Alıntı

Joseph Wood Krutch. Grand Canyon: Today and Its Yesterday. New York: Apollo, 1968.

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