Keith-Lucas, A. (1972). Giving and taking help. University of North Carolina.
Chicagoスタイル(17版)引用形式Keith-Lucas, Alan. Giving and Taking Help. Chapel hill: University of North Carolina, 1972.
MLA(9版)引用形式Keith-Lucas, Alan. Giving and Taking Help. University of North Carolina, 1972.
警告: この引用は必ずしも正確ではありません.