Philippines. Mapping and Resource Information Authority. (1990). Province of Bulacan (Ed. 1, October, 1990.). National Mapping and Resource Information Authority.
Chicago-Zitierstil (17. Ausg.)Philippines. Mapping and Resource Information Authority. Province of Bulacan. Ed. 1, October, 1990. Makati, Metro Manila: National Mapping and Resource Information Authority, 1990.
MLA-Zitierstil (9. Ausg.)Philippines. Mapping and Resource Information Authority. Province of Bulacan. Ed. 1, October, 1990. National Mapping and Resource Information Authority, 1990.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.