found: Llarch, J. El secuestro de la hija ... 1977 (subj.)p. 5 (Carmen Franco, daughter of Francisco Franco) p. 98 (Carmen Franco Polo, marquesa de Villaverde)
found: WW Spain.p. 565 (under Martínez Bordiú, Cristóbal, m. Carmen Franco Polo)
found: Dicc. biog. esp. cont., 1970(under Martínez Bordiú, marqués de Villaverde, m. Carmen Franco Polo)
found: Tit. nobiliario, 1955-56p. 749 (Doña Carmen Franco Polo, Bahamonde y Martínez Valdés, marquesa de Villaverde)
found: Heráldica, 1974 under Villaverde(marquesa Carmen Franco Polo)
found: ABC.es online, obituary dated Dec. 29, 2017, viewed Apr. 15, 2019(Carmen Franco y Polo, María del Carmen Franco y Polo, better known as Carmen Franco; d. in Madrid at age 91; the only child of Spanish dictator Francisco Franco and his wife Carmen Polo; b. Sept. 14, 1926 in Oviedo; upon her father's death, King Juan Carlos I gave her the title Duquesa de Franco)
found: Spanish Wikipedia, Apr. 15, 2019(Carmen Franco y Polo; María del Carmen Franco y Polo; used the title Marquesa consorte de Villaverde during her marriage to Cristóbal Martínez-Bordiú; other titles include Duquesa de Franco, Grande de España, etc.)