APA

Marx K., Engels F., . (1968). Karl Marx and Frederick Engels: selected works in one volume. New York: International Publishers.

Chicago

Marx Karl, Engels Friedrich, . 1968. Karl Marx and Frederick Engels: selected works in one volume. New York: International Publishers.

Harvard

Marx K., Engels F., . (1968). Karl Marx and Frederick Engels: selected works in one volume. New York: International Publishers.

MLA

Marx Karl, Engels Friedrich, . Karl Marx and Frederick Engels: selected works in one volume. New York: International Publishers. 1968.