Hora, Nelda A. <br/><br/>Heograpiya, Kasaysayan, at Sibika at Kultura ng Bansang Pilipinas 4  -- Sampaloc, Manila:  St. Augustine Publications, Inc.,  2000. <br/> ill., <br/><br/><label>ISBN: </label>971-683-306-7 <br/><br/><label>Dewey Class. No.: </label>GSL TB 910 H65 2000