edited by Robert B. Heilman
Prentice-Hall, 1984
Buku Teks SO
Doren, Mark van
Doubleday , 1955
Buku Teks SO
Dodd, E.F.
Macmillan, 1956
Buku Teks
Fakultas Ilmu Pengetahuan Budaya Universitas Indonesia, 1964
UI - Skripsi Membership
Parrott, Thomas Marc
Charles Scribner's Sons, 1955
Buku Teks SO