Barker, J. C., & Christianson, J. (2015). Covered bridges and the birth of American engineering. National Park Service, Historic American Engineering Record.
Chicago Style (17th ed.) CitationBarker, J. C., and Justine Christianson. Covered Bridges and the Birth of American Engineering. Washington, DC: National Park Service, Historic American Engineering Record, 2015.
MLA (9th ed.) CitationBarker, J. C., and Justine Christianson. Covered Bridges and the Birth of American Engineering. National Park Service, Historic American Engineering Record, 2015.
Warning: These citations may not always be 100% accurate.