Burnell, I. The power of positive doing. International Personal Development, Goodwill Publishing House.
Chicagoスタイル(17版)引用形式Burnell, Ivan. The Power of Positive Doing. Center Ossipee, NH : New Delhi: International Personal Development, Goodwill Publishing House.
MLA(8版)引用形式Burnell, Ivan. The Power of Positive Doing. International Personal Development, Goodwill Publishing House.
警告: この引用は必ずしも正確ではありません.