Biographical information with photographs, works, bibliography, discography, and links. Also in French and Spanish.

Biography, works, selected discography, review, and photograph from Schirmer.

Biography at Temple University by Stephen Crawford from Dr. Estrella's Incredibly Abridged Dictionary of Composers.

Miscellaneous songs and cycles from recmusic.org, some with texts.

Biography showing how he combined with the influence of Copland, Cowell and Varèse including noted works and contributions to Mexican culture. From the Grove Concise Dictionary of Music entry at WQXR radio.