penyunting, Masri Singarimbun, Sofian Effendi
LP3ES , 1989
Buku Teks
Gomm, Roger
Palgrave McMillan, 2004
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Toepoel, Vera
SaGE Publications , 2016
Buku Teks
editor Masri Singarimbun, Sofian Effendi
LP3ES, 1982
Buku Teks
edited by Martin Bulmer
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Buku Teks