Libergen, P. M. (2005). Singer's library of song: A vocal anthology of masterworks and folk songs from the medieval era through the twentieth century. Alfred Pub.
Lua i Stíl Chicago (17ú heag.)Libergen, Patrick M. Singer's Library of Song: A Vocal Anthology of Masterworks and Folk Songs from the Medieval Era Through the Twentieth Century. Van Nuys, Claif: Alfred Pub, 2005.
Lua MLA (9ú heag.)Libergen, Patrick M. Singer's Library of Song: A Vocal Anthology of Masterworks and Folk Songs from the Medieval Era Through the Twentieth Century. Alfred Pub, 2005.
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