Department of Public Highways. (1975). Philippine international road signs manual. Department of Public Highways.
Chicago Style (17th ed.) CitationDepartment of Public Highways. Philippine International Road Signs Manual. Manila: Department of Public Highways, 1975.
MLA (9th ed.) CitationDepartment of Public Highways. Philippine International Road Signs Manual. Department of Public Highways, 1975.
Warning: These citations may not always be 100% accurate.