Gregory, E., & Simons, E. N. (1957). The structure of steel: A simple explanation for students, engineers, and buyers of steel. New York: Philosophical Library.
Παραπομπή Chicago StyleGregory, Edwin, and Eric N. Simons. The Structure of Steel: A Simple Explanation for Students, Engineers, and Buyers of Steel. New York: Philosophical Library, 1957.
Παραπομπή MLAGregory, Edwin, and Eric N. Simons. The Structure of Steel: A Simple Explanation for Students, Engineers, and Buyers of Steel. New York: Philosophical Library, 1957.
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