edited by Arthur M. Ross
University of California Press, 1965
Buku Teks
Ginzberg, Eli, 1911-
McGraw-Hill , 1966
Buku Teks
Levitan, Sar A.
Harper & Row , 1982
Buku Teks
Jakubuskas, Edward B.
Addison-Wesley Publishing, 1973
Buku Teks
Salant, Walter S.
Brokkings Institute, 1961
Buku Teks