Carroll, John B.
Harvad University Press, 1953
Buku Referensi
Moore, John A.
Macmillan Publishing Company, 1985
Buku Teks
Stanford University Press, 1967
Buku Teks
Carrol, John
Harvard University Press , 1953
Buku Teks
New York: W.W.Norton & Company, 1988,
Buku Referensi