Engel, L. (1972). Words with music: The Broadway musical libretto. Schirmer.
Lua i Stíl Chicago (17ú heag.)Engel, Lehman. Words with Music: The Broadway Musical Libretto. New York: Schirmer, 1972.
Lua MLA (8ú heag.)Engel, Lehman. Words with Music: The Broadway Musical Libretto. Schirmer, 1972.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.