Jakubuskas, Edward B.
Addison-Wesley Publishing, 1973
Buku Teks
Ruchlin, Hirsch S
Charles C Thomas , 1973
Buku Teks
Mc Graw-Hill, 1974
Buku Teks
Brownlee, O.H. (Oswald Harvey), 1917-
Prentice-Hall, 1954
Buku Teks
Hitch, Charles J.
Harvard University Press, 1961
Buku Teks