Leonard, V. A. (1964). The police of the 20th century. Foundation Press.
Chicagoスタイル(17版)引用形式Leonard, Vivian Anderson. The Police of the 20th Century. Brooklyn: Foundation Press, 1964.
MLA(9版)引用形式Leonard, Vivian Anderson. The Police of the 20th Century. Foundation Press, 1964.
警告: この引用は必ずしも正確ではありません.