Villegas, B. M. (1983). Strategies for crisis. Center for Research and Communication.
Chicagoスタイル(17版)引用形式Villegas, Bernardo M. Strategies for Crisis. [Pasig, Metro Manila]: Center for Research and Communication, 1983.
MLA(9版)引用形式Villegas, Bernardo M. Strategies for Crisis. Center for Research and Communication, 1983.
警告: この引用は必ずしも正確ではありません.