Wester, P. J. (1977). Zamboanga Province: Its natural resources and opportunities for agricultural development [microform]. Photoduplication Service, University of the Philippines Library.
Citazione stile Chigago Style (17a edizione)Wester, Peter Johnson. Zamboanga Province: Its Natural Resources and Opportunities for Agricultural Development [microform]. Quezon City: Photoduplication Service, University of the Philippines Library, 1977.
Citatione MLA (9a ed.)Wester, Peter Johnson. Zamboanga Province: Its Natural Resources and Opportunities for Agricultural Development [microform]. Photoduplication Service, University of the Philippines Library, 1977.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.