Knapp, B. J., Ross, S. R., & McCrae, D. L. (1989). Challenge of the human environment. Longman.
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Tohutoru Kātū Chicago (17th ed.)
Knapp, Brian J., Simon R.J Ross, me Duncan L.R McCrae. Challenge of the Human Environment. Harlow: Longman, 1989.
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Tohutoro MLA (9th ed.)
Knapp, Brian J., et al. Challenge of the Human Environment. Longman, 1989.
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