Buku Teks
edited by P. Edward Haley, David M. Keithly, and Jack Merritt
Westview Press, 1985
Buku Teks
Hsieh, Alice Langley
Prentice-Hall, 1962
Buku Teks
by Gerhart Friedlander [and others]
John Wiley & Sons, 1981
Buku Teks
Green, Alex Edward Samuel, 1919-
McGraw-Hill, 1955
Buku Teks