Nelson, S. M. (1980). Tetratunes for Violin - Viola - Cello: Teacher's book with accompaniments / by Sheila M. Nelson. Boosey & Hawkes.
Čikaški stil citiranja (17. izdanje)Nelson, Sheila M. Tetratunes for Violin - Viola - Cello: Teacher's Book with Accompaniments / by Sheila M. Nelson. London: Boosey & Hawkes, 1980.
MLA način citiranja (8. izdanje)Nelson, Sheila M. Tetratunes for Violin - Viola - Cello: Teacher's Book with Accompaniments / by Sheila M. Nelson. Boosey & Hawkes, 1980.
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