Agustono, Budi; Syofian, Eddy; Takari, Muhammad; Dewi, Heritina; Harahap, Fitriaty; Yulhasni; Sumarno, Edi (2013), Para Gubernur Sumatera Utara: Kajian Sejarah, Sosial, dan Budaya [Governors of North Sumatra: Historical, Social, and Cultural Assessment] (bằng tiếng Indonesia), Medan: University of North Sumatra
