Freidel, F., & Pollack, N. (1966). American Issues in theTwentieth Century. Sceintific Book Company.
استشهاد بنمط شيكاغوFreidel, Frand, و Norman Pollack. American Issues in TheTwentieth Century. Calcutta: Sceintific Book Company, 1966.
MLA استشهادFreidel, Frand, و Norman Pollack. American Issues in TheTwentieth Century. Sceintific Book Company, 1966.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.