Lena, H. F., Helmreich, W. B., & McCord, W. J. (1992). Contemporary issues in Society. McGraw-Hill,c.
Lua i Stíl Chicago (17ú heag.)Lena, Hugh F., William B. Helmreich, agus William J. McCord. Contemporary Issues in Society. New York: McGraw-Hill,c, 1992.
Lua MLA (8ú heag.)Lena, Hugh F., et al. Contemporary Issues in Society. McGraw-Hill,c, 1992.
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