Gorbachev, Mikhail, author
Jakarta Gelora Aksara Pratama 1992,
Buku Teks
Anton Tabah, author
Klaten Sahabat 2000,
Buku Teks
Siagian, F. Sihol
Gramedia Widiasarana , 1999
Buku Teks
Adi Suryadi Cula, author
RajaGrafindo Persada, 1999
Buku Teks
Syafriadi Asri, author
Universitas Indonesia, 2007
UI - Tesis Membership