APA-čujuhus (7. p.)
Higgins, L., & Campbell, P. S. (2010). Free to be musical: Group improvisation in music. Rowman & Littlefield Education.
Chicago-čujuhus (17. p.)
Higgins, Lee, juo Patricia Shehan Campbell. Free to Be Musical: Group Improvisation in Music. Lanham, MD: Rowman & Littlefield Education, 2010.
MLA-čujuhus (9. p.)
Higgins, Lee, juo Patricia Shehan Campbell. Free to Be Musical: Group Improvisation in Music. Rowman & Littlefield Education, 2010.
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