Nainggolan, Pahala, author
RajaGrafindo Persada, 2005
Buku Teks
Nainggolan, Pahala, author
PPM, 2004
Buku Teks
Indra Bastian, author
Erlangga, 2007
Buku Teks
Nainggolan, Pahala, author
Yayasan Bina Integrasi Edukasi, 2012
Buku Teks
Yoko H. Haryono, author
2003
UI - Tesis (Membership)