Philippines. Bureau of Posts. Planning Division. (1976). Systems study: Postal operations. The Bureau.
Citazione stile Chigago Style (17a edizione)Philippines. Bureau of Posts. Planning Division. Systems Study: Postal Operations. [Manila]: The Bureau, 1976.
Citatione MLA (9a ed.)Philippines. Bureau of Posts. Planning Division. Systems Study: Postal Operations. The Bureau, 1976.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.