" ... mensário de orientação marxista."--No. 1, p. 1.
Microfilm. no. 1-6 (Sept. 1957-May 1958) Riverside, Calif. : Microfilmed and distributed by Custom Microfilm Systems, 1974. 1 microfilm reel ; 35 mm. (Latin American perspectives. Microfilm series). Master negative held by Center for Research Libraries, Chicago, Ill. Master negative number: CUSTOM 2004567.