Rebecca Ramilo Ongsoto, Reena R. Ongsoto: Philippine History Module-based▁Learning. ⁇ .Philippine History Module-based▁Learning Rex Bookstore Inc, 2. Auflage 2003, ISBN 9712349X, p. 109 (online kopya, p. 109, at Google Books).  ⁇ .ISBN. ⁇ . ⁇ .9712349X.  ⁇ .online▁copy. ⁇ ., p. 109, sa. ⁇ .Google Books