Nainggolan, Pahala, author
PPM, 2004
Buku Teks
Nainggolan, Pahala, author
RajaGrafindo Persada, 2005
Buku Teks
Glaser, Ernst, author
Gadjah Mada University Press, 1987
Buku Teks
Glaser, Ernst, author
Gadjah Mada University Press, 1987
Buku Teks
Yoko H. Haryono, author
2003
UI - Tesis (Membership)