Walker, D. (1990). Customer first: A strategy for quality service. Gower.
Chicagoスタイル(17版)引用形式Walker, Denis. Customer First: A Strategy for Quality Service. Aldershot, Hants, England: Gower, 1990.
MLA(9版)引用形式Walker, Denis. Customer First: A Strategy for Quality Service. Gower, 1990.
警告: この引用は必ずしも正確ではありません.