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2. 2) 日本道路協会: 道路橋示方書・同解説, 1980.
3. 3) 林野庁林産課監修: 大断面集成材建築物の手引き, 1985.
4. 4) Tuomi, R. L.: Advancements in Timber Bridges through Research and Engineering, Proc. of 13th Ann. Colo. State Univ. Bridge Eng. Conf., pp. 34-61, 1972.
5. 5) American Society of Civil Engineers, ASCE Committee on History and Heritage of American Civil Engineering American Wooden Bridges, ASCE Historical Publication No. 4, 1976.