Borland, Russell
Elex Media Komputindo, 1991
Buku Referensi
Grauer, Robert T., author
Pearson Education, 2003
Buku Teks
Gange, John
Public Administration Clearing House, 1953
Buku Teks
Luluk Tri Wulandari, author
UI - Makalah dan Kertas Kerja
Christoper, author
Dinastindo, 1992
Buku Teks