Philippines Department of Tourism.National Capital Region. (1991). 1991 tourism situation report: NCR. Department of Tourism.
Citazione stile Chigago Style (17a edizione)Philippines Department of Tourism.National Capital Region. 1991 Tourism Situation Report: NCR. Manila: Department of Tourism, 1991.
Citatione MLA (9a ed.)Philippines Department of Tourism.National Capital Region. 1991 Tourism Situation Report: NCR. Department of Tourism, 1991.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.