Fritsch, E. C. (1955). Science teaching aids for a stronger America. s.n.
Chicagoスタイル(17版)引用形式Fritsch, Emery C. Science Teaching Aids for a Stronger America. Illinois: s.n, 1955.
MLA(9版)引用形式Fritsch, Emery C. Science Teaching Aids for a Stronger America. s.n, 1955.
警告: この引用は必ずしも正確ではありません.