APA

Lewis, 1., Heebink, 1., Cottingham, W., Dawley, E., & Products Laboratory (U.S.), F. (1960). Supplement to design of plywood webs in box beams : buckling in shear webs of box and I-beams and the effect upon design criteria. : Madison, Wis. : U.S. Dept. of Agriculture, Forest Service, Forest Products Laboratory.