Hopson, B. (1994). Twelve steps to success through service. Excel.
Chicagoスタイル(17版)引用形式Hopson, Barrie. Twelve Steps to Success Through Service. New Delhi: Excel, 1994.
MLA(9版)引用形式Hopson, Barrie. Twelve Steps to Success Through Service. Excel, 1994.
警告: この引用は必ずしも正確ではありません.