Simanjuntak, Daniel Tumpal S., author
1999
UI - Tesis (Membership)
Johnson, Paul M., author
Teraju, 2003
Buku Referensi
Sri Redjeki Hartono, author
Ghalia Indonesia, 2010
Buku Teks
Winardi, author
Mandar Maju, 1989
Buku Referensi
Elips, 1997
Buku Teks