Acker, R. Gustav Regler and Ramón Sender: A Comparative Study of their Mexican Exile: Robert Acker. Latin America and the literature of exile : a comparative view of the 20. century European refugee writers in the New World.(1983).

Acker, Robert. "Gustav Regler and Ramón Sender: A Comparative Study of Their Mexican Exile: Robert Acker." Latin America and the Literature of Exile : A Comparative View of the 20. Century European Refugee Writers in the New World.(1983) .

Acker, Robert. "Gustav Regler and Ramón Sender: A Comparative Study of Their Mexican Exile: Robert Acker." Latin America and the Literature of Exile : A Comparative View of the 20. Century European Refugee Writers in the New World.(1983), .