McLemore, S Dale
Allyn and Bacon, 1983
Buku Teks
Epps, Edgar G.
Winthrop Publisher,INC, 1973
Buku Teks
Banton Michael
Tavistock Publications, 1969
Buku Teks
Mason, Philip
Oxford University Press, 1970
Buku Teks
Budihastuti
1981
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