Keith-Lucas, A. (1994). Giving and taking help (Rev. ed.). NAA.
Chicagoスタイル(17版)引用形式Keith-Lucas, Alan. Giving and Taking Help. Rev. ed. Pennsylvania: NAA, 1994.
MLA(9版)引用形式Keith-Lucas, Alan. Giving and Taking Help. Rev. ed. NAA, 1994.
警告: この引用は必ずしも正確ではありません.