Introduction to socialism /
[by] Leo Huberman and Paul M. Sweezy. With an introductory essay by Albert Einstein.

APA Citation

Huberman, L., Sweezy, P. M. (Paul Marlor). (1968). Introduction to socialism. New York: [Monthly Review Press].

MLA Citation

Huberman, Leo, 1903-1968, and Paul M. (Paul Marlor) Sweezy. Introduction to Socialism. New York: [Monthly Review Press], 1968.

Warning: These citations may not always be complete (especially for serials).