Whitney, F. (1931). Blackboard sketching. Milton Bradley Co..
Chicagoスタイル(17版)引用形式Whitney, Frederick. Blackboard Sketching. Springfield, Mass. : New York [etc.]: Milton Bradley Co., 1931.
MLA(8版)引用形式Whitney, Frederick. Blackboard Sketching. Milton Bradley Co., 1931.
警告: この引用は必ずしも正確ではありません.