por Schafer, Roy [autor].
por Rapaport, David [autor] | Schafer, Roy [autor] | Gill, Merton M. (Merton Max), 1914-1994 [autor].
por Rapaport, David [autor] | Schafer, Roy [autor] | Holt, Robert R [editor] | Gill, Merton M. (Merton Max), 1914-1994 [autor] | University of London.
por Mayman, Martin [autor] | Schafer, Roy.