Stigler, George J.
Princeton University Press , 1963
Buku Teks
Fenstermaker, J. Van
Meredith , 1969
Buku Teks
Goldsmith, Raymond W.
Columbia University Press , 1965
Buku Teks
Dougall, Herbert E., author
Prentice-Hall, 1970
Buku Teks
Ray, George E.
Prentice-Hall, 1972
Buku Teks