50 years of world revolution 1917-1967 : : an international symposium / / edited, with an introduction and article by Ernest Mandel.

MLA

Mandel, Ernest, James P Cannon, and Fernand Charlier. 50 Years of World Revolution 1917-1967 : an International Symposium. New York: Merit Publishers, 1968.

APA

Mandel, E., Cannon, J. P, & Charlier, F. (1968). 50 years of world revolution 1917-1967 : an international symposium. New York: Merit Publishers.

Chicago

Mandel, Ernest, James P Cannon, and Fernand Charlier. 50 Years of World Revolution 1917-1967: An International Symposium. New York: Merit Publishers, 1968.