Alvarez, José S.‏ ‎ 1858-1903 (José Sixto) (Personal Name)

Los mejores cuentos de Fray Mocho, 1994:‏ ‎ t.p. (José S. Alvarez) p. 11, etc. (José Zeferino Alvarez, middle name variously given as Seferino or Ceferino; journalist using numerous pseuds. including Fray Mocho; d. 23 Aug. 1903; b. 26 Aug. 1858 in Gualeguaychú)‏

Misterios de Buenos Aires, 1897:‏ t.p. (Fabio Carrizo)‏

Gran enciclopedia argentina, 1956:‏ ‎ (José S. Alvarez; made the pseudonym Fray Mocho popular; also published "Memorias de un vigilante" under pseudonym Fabio Carrizo; middle name given: Zeferino; José Sixto is wrong)