Gaya APA

McWilliams, W, C., Piotrowski, H. (1990). The world since 1945 : a history of international relations (2nd.ed.). Boulder: Lynne Rienner Pub..

Gaya MLA

McWilliams, Wayne, C., Piotrowski, Harry. "The world since 1945 : a history of international relations". 2nd.ed. Boulder: Lynne Rienner Pub., 1990. Text.