American Economic Association
George Allen and Unwin, 1959
Buku Teks
Burke, Karen C., 1951-
West Publishing, 1992
Buku Teks
Burke, Karen C., 1951-
Thomson/West, 1999
Buku Teks
Gelfand, M. David
West Publishing, 1986
Buku Teks
Butters, J. Keith
Harvard University Press , 1951
Buku Teks