Philippine Islands. Office of the Collector of Customs, Philippine Islands. Philippine Customs Service, & Shuster W. Morgan. (1977). Special report. 1st. 188- [microform]. Photoduplication Service, University of the Philippines Library.
Chicago-referens (17:e uppl.)Philippine Islands. Office of the Collector of Customs, Philippine Islands. Philippine Customs Service, och Shuster W. Morgan. Special Report. 1st. 188- [microform]. Quezon City: Photoduplication Service, University of the Philippines Library, 1977.
MLA-referens (9:e uppl.)Philippine Islands. Office of the Collector of Customs, et al. Special Report. 1st. 188- [microform]. Photoduplication Service, University of the Philippines Library, 1977.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.