Steel beam construction

Chicago citation style
Swift, W. A. (William Arthur), 1877-1956. Steel beam construction. circa 1930. Retrieved from the Digital Public Library of America, http://libx.bsu.edu/cdm/ref/collection/swift/id/961. (Accessed July 20, 2018.)
APA citation style
Swift, W. A. (William Arthur), 1877-1956, (circa 1930) Steel beam construction. Retrieved from the Digital Public Library of America, http://libx.bsu.edu/cdm/ref/collection/swift/id/961
MLA citation style
Swift, W. A. (William Arthur), 1877-1956. Retrieved from the Digital Public Library of America <http://libx.bsu.edu/cdm/ref/collection/swift/id/961>.
Note: These citations are programmatically generated and may be incomplete.