APA-referens (7:e uppl.)

Philippines Dept. of Public Works, Transportation and Communications. (1977). Analysis of typology dynamics: National level. DPWTC.

Chicago-referens (17:e uppl.)

Philippines Dept. of Public Works, Transportation and Communications. Analysis of Typology Dynamics: National Level. Quezon City: DPWTC, 1977.

MLA-referens (9:e uppl.)

Philippines Dept. of Public Works, Transportation and Communications. Analysis of Typology Dynamics: National Level. DPWTC, 1977.

Varning: dessa hänvisningar är inte alltid fullständigt riktiga.