APA

Ringelstetter, L., Norris, 1., & Products Laboratory (U.S.), F. (1959). The effect of a stiffener on the maximum load of flat plywood plates in edgewise compression, with the face grain at 0 degrees and 90 degrees to the load : A single stiffener parallel to the direction of loading : Load edges clamped, others simply supported. : Madison, Wis. : U.S. Dept. of Agriculture, Forest Service, Forest Products Laboratory.