Locke, John
J.M. Dent and Sons , 1947
Buku Teks
Huxley, Aldous
New York, Harper & Brothers, 1956
Buku Teks
Harper & Row Publishers, 1959
Buku Teks
Arnold, Matthew
Oxford University Press, 1925
Buku Teks
Locke, John
Hackett Publishing Company, Inc., 1996
Buku Teks