(1990). Man and his environment: In harmony and in conflict. The Center for Humanities.
Čikaški stil citiranja (17. izdanje)Man and His Environment: In Harmony and in Conflict. [S.l.]: The Center for Humanities, 1990.
MLA način citiranja (9. izdanje)Man and His Environment: In Harmony and in Conflict. The Center for Humanities, 1990.
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