Walling, D. R. (1995). At the threshold of the millenium. Phi Delta Kappa Educational Foundation.
Chicagoスタイル(17版)引用形式Walling, Donovan R. At the Threshold of the Millenium. Indiana: Phi Delta Kappa Educational Foundation, 1995.
MLA(9版)引用形式Walling, Donovan R. At the Threshold of the Millenium. Phi Delta Kappa Educational Foundation, 1995.
警告: この引用は必ずしも正確ではありません.