Criste, Erin (February 2013). "Steel Interchange"(PDF). Modern Steel Construction. Archived from the original(PDF) on 2014-07-02. Retrieved 2013-03-04.
Criste, Erin (February 2013). "Steel Interchange"(PDF). Modern Steel Construction. Archived from the original(PDF) on 2014-07-02. Retrieved 2013-03-04.