Bailey, Thomas Andrew, 1902-1983
D.C. Healt, 1987
Buku Teks
Ferrell, Robert H.
W.W. Norton, 1959
Buku Teks
Morris, Richard B.
Harper & Row, 1961
Buku Teks
Kraus, Michael
University of Oklahoma Press, 1953
Buku Teks
Smelser, Marshall
Barnes & Noble, 1873
Buku Teks