Copland, A. (1989). Four early songs: For voice and piano / Aaron Copland. Boosey & Hawkes.
Chicago-viite (17. p.)Copland, Aaron. Four Early Songs: For Voice and Piano / Aaron Copland. Bonn: Boosey & Hawkes, 1989.
MLA-viite (8. p.)Copland, Aaron. Four Early Songs: For Voice and Piano / Aaron Copland. Boosey & Hawkes, 1989.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.