Japan International Cooperation Agency. (1987). Feasibility study of the road improvement project on the Pan-Philippine Highway (Philippines-Japan Friendship Highway). Japan International Cooperation Agency ; Department of Public Works and Highways.
Chicago-referens (17:e uppl.)Japan International Cooperation Agency. Feasibility Study of the Road Improvement Project on the Pan-Philippine Highway (Philippines-Japan Friendship Highway). Manila: Japan International Cooperation Agency ; Department of Public Works and Highways, 1987.
MLA-referens (9:e uppl.)Japan International Cooperation Agency. Feasibility Study of the Road Improvement Project on the Pan-Philippine Highway (Philippines-Japan Friendship Highway). Japan International Cooperation Agency ; Department of Public Works and Highways, 1987.