edited by Gabriel A. Almond, James S. Coleman
Princeton University Press, 1960
Buku Teks
Duchacek, Ivo D., author
Dryden Press, 1971
Buku Teks
edited by John M. Bennett and Robert E. Kalman
North Holland, 1981
Buku Teks
Jones, Gavin W., author
Irvington, 1975
Buku Teks
Jones, Gavin W., author
Irvington, 1975
Buku Teks