MCMerney, John Peter
Harvard University, 1961
Buku Teks
Awad, Elias M., author
Prentice-Hall, 1966
Buku Teks
Brooks, Frederick P. Jr., author
John Wiley & Sons, 1969
Buku Teks
Gregory, Robert Henry, author
Wadsworth, 1960
Buku Teks
Fried, Louis, author
Reston Publishing, 1979
Buku Teks