Evy Clara, author
UNJ Press, 2021
Buku Teks
Nangoi, Ronald, author
RajaGrafindo Persada, 1996
Buku Teks
Sitohang, Hotma , author
1997
UI - Tesis (Membership)
Hasibuan, Malayu S. P., author
Bumi Aksara, 2003
Buku Teks
Siagian, Sondang P., author
Bumi Aksara, 1993
Buku Teks