APA (7e ed.) Bronvermelding

Philippines. Department of Public Works, Transportation and Communications, & Planning and Project Development Office. (1972). Pre-feasibility study: Marikina-Infanta road. PPDO.

Chicago (17e ed.) Bronvermelding

Philippines. Department of Public Works, Transportation and Communications, en Planning and Project Development Office. Pre-feasibility Study: Marikina-Infanta Road. Manila: PPDO, 1972.

MLA (9e ed.) Bronvermelding

Philippines. Department of Public Works, Transportation and Communications, en Planning and Project Development Office. Pre-feasibility Study: Marikina-Infanta Road. PPDO, 1972.