Beckwith, H. Selling the Invisible. Warner Books.
Chicagoスタイル(17版)引用形式Beckwith, Harry. Selling the Invisible. Warner Books.
MLA(9版)引用形式Beckwith, Harry. Selling the Invisible. Warner Books.
警告: この引用は必ずしも正確ではありません.
APA(7版)引用形式