Bernad, M. Butuan or Limasawa?: The Site of the First Mass in the Philippines, a Re-examination of the Evidence. s.l. : (n.p.), 1983.

Ventura Jr., S. Bucket List Philippines. s.l. : Eastgate Publishing Corp, (n.d.).

Castelo, Lea. This is the Philippines!. s.l. : (n.p.), (n.d.).

Garcia, C. Inside the Philippines. s.l. : (n.p.), 1968.

Gonzales III, Joaquin I. Countries of the World: The Philippines. s.l. : Gareth Stevens Publishing, 2001.

Caltex Philippines. Philippines Touring Guide (45th Ed.). s.l. : Caltex Philippines, 1969.

De La Costa, H. Readings in Philippine History: Selected Historical Texts Presented With a Commentary. s.l. : Bookmark Inc., 1965.

Foronda, M. Kasaysayan: Studies on Local and Oral History. s.l. : De La Salle University Press, 1991.

Ika-400 Taon Pagkatatag ng Bayang Calumpit (1575-1975). Manila : Jonef Publications, 1975.

Ellis, H. Hong Kong to Manila and the Lakes of Luzon, in the Philippine Isles, in the Year 1856. s.l. : (n.p.), 1859.