Bellas, Carl J.
Praeger, 1972
Buku Teks
Journard, Isabella
OCDE Development Center, 1992., 1992
Buku Teks
Friedrich, Carl J.
Mass. Graduate School of Pub. Adm., 1958
Buku Teks
Pacifico, Carl R.
John Wiley , 1981
Buku Teks
Hovland, Carl I
Yale University Press , 1966
Buku Teks