Alvaro de Córdoba y la ... 1996 p. 15, etc. (his name was Albarus, co-name: Paulus; besides Paulus the names Aurelio Flavio sometimes appear but have been determined to be honorific titles; Albarus Paulus Cordubensis i.e. Alvaro Paulo de Córdoba; probably b. between 800-815) p. 21 (probably d. sometime between 862-863)
Die Märtyrer von Cordoba, c2007 p. 11, etc. (Albarus Cordubensis; Alvar; d. Nov. 7, 861/2)
Encic. univ. ilus., 1907 (Alvaro (Paulo); muzárabe Cristian who lived in Córdoba in the 9th century; d. 861)
González Muñoz, F. Latinidad mozárabe, 1996 t.p. (Albaro de Córdoba) p. 253 (Albarus Cordubensis)
NUC Pre-1956 imprints, v. 7 (Albarus, Paulus, d. ca. 861)