Ashton, Robert, author
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Buku Teks
edited by Michael S. Lewis-Beck
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Buku Referensi
Rijanto Tosin, author
Dinastindo, 1991
Buku Referensi
Hendry Azwar, author
Fakultas Kesehatan Masyarakat Universitas Indonesia, 2014
UI - Tesis Membership
Lindeman, Carol A., author
W.B. Saunders, 1999
Buku Teks