Princess Urduja, Queen of the Orient Seas : before and after her time in the political orbit of the Shri-vi-ja-ya and Madjapahit maritime empire : a pre-Hispanic history of the Philippines - Del Castillo y Tuazon, Antonio, 1908- (Lingayen, Pangasinan : A. del. Castillo y Tuazon, 1988)
Keywords: Philippines -- History -- To 1521.