Frederick, J. G. (1929). Selling by telephone. Business Bourse Publishers.
Chicagoスタイル(17版)引用形式Frederick, J. George. Selling by Telephone. New York: Business Bourse Publishers, 1929.
MLA(8版)引用形式Frederick, J. George. Selling by Telephone. Business Bourse Publishers, 1929.
警告: この引用は必ずしも正確ではありません.