Salma Izzatii, author
Universitas Indonesia, 2014
UI - Skripsi (Membership)
Enny Soeprapto, author
2004
Artikel Jurnal
Sealey, Raphael, author
University of North Carolina Press, 1990
Buku Teks
Gary Joseph, Georgina Carson, Phyllis Brodkin, William Abbott, Geuffrey Wells
Carswell, 2011
Buku Referensi
Williams & Willkins, 1989
Buku Teks