edited by Richard A. Easterlin
University of Chicago Press, 1980
Buku Teks
Weiss, John
Prentice-Hall, 1995
Buku Teks
Adelman, Irma
Stanford University Press , 1973
Buku Teks
Lieu, D.K.
Rutgers University Press, 1948
Buku Teks
Mackillop, Andrew
Frances Pinter , 1983
Buku Teks