By Linnér, Birgitta.
México Ed. Diana 1968 .
245 p.

By Madrid Mesa, Pedro Pablo..
Bogotá Ed. "Diana" 1963 .
67 p. 24 cm..

By Wright, C W of Toronto.
Mexico D. F., Ed. Diana. S. A. 1960 .
220 p. , Titulo en ingles: How to speak in public.

By Mercer Francisco, L.
Mexico Ed. Diana 1962 .
326 p. , Original title: The more you show the more you sell.

By Laxair, Robert.
Mexico Ed. Diana 1966 .
173 p. , Original title: A man in the wheatfield.

By Ludwig, Emil.
Mexico Ed. Diana 1949 .
302 p

By Hilts, Elizabeth..
México, D.F. Ed. Diana 2003 .
103 p. 21 cm..
9681336690 (pbk.)