Jardine, Lisa
Routledge, 1996
Buku Teks SO
edited by Robert B. Heilman
Prentice-Hall, 1984
Buku Teks SO
Utami Diah Kusumawati
Fakultas Ilmu Pengetahuan Budaya Universitas Indonesia, 2007
UI - Skripsi Membership
Bache, William B.
Peter Lang, 1991
Buku Teks SO
Doren, Mark van
Doubleday , 1955
Buku Teks SO