Cawkell, A.E.
Gower, 1994
Buku Referensi
Heany, Donald F., author
Ronald Press, 1968
Buku Teks
Doyle, Lauren B., author
John Wiley & Sons, 1975
Buku Teks
Tucker, Allen B., author
Academic Press, 1979
Buku Teks
Maudiah Dwi Oktari, author
Fakultas Ilmu Administrasi Universitas Indonesia, 2011
UI - Skripsi (Open)