Pitt, David C.
Holt, Rinehart and Winston, 1972
Buku Teks
Berkhofer, robert F
The Free press, 1969
Buku Teks
Burke, Peter, author
Stanford University Press, 1990
Buku Teks
Carey, Stephen S.
Thomson Wadsworth, 2004
Buku Teks
edited by Luca Fiorito, Scott Scheall; Carlos Eduardo Suprinyak
Emerald, 2017
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