by Claire Selltiz ... [and others]
Methuen, 1965
Buku Teks
Judd, Charles M.
Methuen, 1991
Buku Teks
by Louise H. Kidder ... [and others]
Holt, Rinehart and Winston, 1981
Buku Teks
Lamont, Christopher K.
Sage Publications Ltd., 2015
Buku Teks
Dunn, Dana S.
Wiley-Blackwell, 2009
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