MLA

Hyttinen, Axel, Earl R Schafer, and Forest Products Laboratory (U.S.). The Grinding of Hardwoods : Experiments On Eastern Cottonwood, Yellow-poplar, Sugar Maple, Black Tupelo, White Ash, Birch, and Sweetgum. : Madison, Wis. : U.S. Dept. of Agriculture, Forest Service, Forest Products Laboratory, 1948.