APA-ийн эшлэл(7 дахь хэвлэлт)

Higgins, L., & Campbell, P. S. (2010). Free to be musical: Group improvisation in music. Rowman & Littlefield Education.

Чикаго-гийн эшлэл (17 дахь хэвлэлт)

Higgins, Lee, ба Patricia Shehan Campbell. Free to Be Musical: Group Improvisation in Music. Lanham, MD: Rowman & Littlefield Education, 2010.

MLA -ийн эшлэл (9 дэх хэвлэлт)

Higgins, Lee, ба Patricia Shehan Campbell. Free to Be Musical: Group Improvisation in Music. Rowman & Littlefield Education, 2010.