Philippines. Department of Public Works, Transportation and Communications, & Planning and Project Development Office. (1972). Pre-feasibility study: Marikina-Infanta road. PPDO.
Citazione stile Chigago Style (17a edizione)Philippines. Department of Public Works, Transportation and Communications, e Planning and Project Development Office. Pre-feasibility Study: Marikina-Infanta Road. Manila: PPDO, 1972.
Citatione MLA (9a ed.)Philippines. Department of Public Works, Transportation and Communications, e Planning and Project Development Office. Pre-feasibility Study: Marikina-Infanta Road. PPDO, 1972.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.