Herbella y Perez, M. (1976). Manual de construcciones y de fortificacion de campana en Filipinas [microform]. Photoduplication Service, University of the Philippines Library.
Citazione stile Chigago Style (17a edizione)Herbella y Perez, Manuel. Manual De Construcciones Y De Fortificacion De Campana En Filipinas [microform]. Quezon City: Photoduplication Service, University of the Philippines Library, 1976.
Citatione MLA (9a ed.)Herbella y Perez, Manuel. Manual De Construcciones Y De Fortificacion De Campana En Filipinas [microform]. Photoduplication Service, University of the Philippines Library, 1976.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.