Rosenwasser, David
Fort Worth Harcourt Brace College 1997,
Buku Referensi
Plamenatz, John
National News-Letter, 1949
Buku Teks
Parish, James Robert, author
Mizan Learning Center, 2006
Buku Teks
King-Hall, Stephen
Faber and Faber, 1943
Buku Teks
Anton Sutandio, author
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2003
UI - Tesis (Membership)