Nicholl, Robert. Raja Bongsu of Sulu : a Brunei hero in his times / Robert Nicholl. - Kuala Lumpur : Malaysian Branch of the Royal Asiatic Society, 1991. - 78 p. ; 24 cm. - Monograph (Malaysian Branch of the Royal Asiatic Society) no.19. . ISBN: 9839961411 9839961438 RM30.00 Subjects--Personal Names: Raja Bongou. Subjects--Geographic Terms: Brunei--Kings and rulers.Brunei--History.