found: His La pasión de comprender, 1983:t.p. (Manuel Caballero)
found: LC data base, 8/24/84(hdg.: Caballero, Manuel, Venezuelan; usage: Manuel Caballero)
found: Gómez, el tirano liberal, 1993:t.p. (Manuel Caballero) cover p. 4 (b. 1931)
found: Defensa e ilustración de la pereza, 1998:t.p. (Manuel Caballero) front flap (holds Ph. D. from the University of London; professor of contemporary history at the Universidad Central de Venezuela)
found: Peña Rojas, Vanessa. Manuel Caballero, militante de la disidencia, 2007:p. 5 (Manuel Antonio Caballero Agüero, b. Caracas, Dec. 5, 1931)
found: Spanish Wikipedia WWW site, Dec. 14, 2010(under Manuel Caballero: Manuel Antonio Caballero Agüero; b. Dec. 5, 1931, Barquisimeto; d. Dec. 12, 2010, Caracas; Venezuelan historian, journalist, author, and teacher)