Maryam Catlea Umar
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2000
UI - Skripsi Membership
Artikel Jurnal
edited by Tom Sorell
Routledge, 1998
Buku Teks
Darr, Kurt
The John Hopkins University Press , 1997
Buku Teks
Kerridge, Ian
Social Science Press, 1998
Buku Teks SO