Tolong jelaskan mengenai Rujukan dari Ismail dari Siak

Donald James Goudie, Phillip Lee Thomas, Tenas Effendy, (1989), Syair Perang Siak: a court poem presenting the state policy of a Minangkabau Malay royal family in exile, MBRAS.

Christine E. Dobbin, (1983), Islamic revivalism in a changing peasant economy: central Sumatra, 1784-1847, Curzon Press, ISBN 0-7007-0155-9.

Journal of Southeast Asian studies, Volume 17, McGraw-Hill Far Eastern Publishers, 1986.