Abu si Singamangaraja : arti historis, politis, ekonomis dan religius si Singa mangaraja XII - Sijabat, W. Bonar (Walter Bonar), 1931- (Jakarta : Penerbit Sinar Harapan, 1982)
Bibliography : page 466-484
Keywords: Sisingamangaraja XIII, -- Raja, -- 1860-1907.; Batak -- Politics and government; Sumatera Utara (Indonesia) -- Politics and government