Sitepu, Anwar, author
Kementerian Sosial Republik Indonesia, 2017
Artikel Jurnal
Jellinek, Lea, author
Allen and Unwin, 1991
Buku Teks
Taylor, Jean Gelman, 1944-, author
University of Wisconsin Press, 1983
Buku Teks
Wertheim, W.F. (Willem Frederik), author
Tiara Wacana Yogya, 1999
Buku Teks
Anitasa Dewi, author
Universitas Indonesia, 2005
UI - Tesis (Membership)