Atina Winaya
Fakultas Ilmu Pengetahuan Budaya Universitas Indonesia, 2008
UI - Skripsi Open
Anthonio akkermans, Peter G. Drake, Bill Mattos, andy Middleton
Hermes House, 2011
Buku Referensi
Gorki, Maxim
T. Werner Laurie, [Date of publication not identified]
Buku Teks SO
Ambrose, Timothy
Routledge, 1995
Buku Teks SO
Hooper-Greenhill, Eilean
Routledge, 1996
Buku Teks SO