Greenwood, Susan, author
Berg, 2000
Buku Teks
Webster, Hutton
Stanford University Press, 1948
Buku Teks
Universitas Indonesia, 2006
UI - Skripsi (Membership)
Harman, Jeanne Perkins, author
Appleton-Century-Crofts, 1961
Buku Teks
Atkinson, Donald T
The World Publishing, 1956
Buku Teks