Gerakan sosial baru di Toba Samosir: studi kasus gerakan perlawanan rakyat terhadap Indorayon = New social movement in Toba Samosir, people resistance movement to Indorayon (Period 1983-2000) as a case study - Silaen, Victor M., author (Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2004)