Panggabean, Mutiara S., author
1988
UI - Tesis Membership
Siagian, Sondang P., author
Haji Masagung, 1993
Buku Teks
Siagian, Sondang P., author
Gunung Agung, 1982
Buku Teks
Davis, Keith, 1918-, author
Erlangga, 1995
Buku Teks
Wexley, Kenneth N., author
Asdi Mahasatya, 2005
Buku Teks