Harris, Seymour E.
McGraw-Hill, 1962
Buku Teks
Duronio, Margaret A.
Jossey - Bass Publishers , 1991
Buku Teks SO
Wiggins, Sam P.
McCutchan, 1966
Buku Teks
DeVane, William Clyde
Harvard University Press, 1965
Buku Teks
Karol, Nathaniel H.
John Wiley & Sons, 1980
Buku Teks