Hilley, M., & Olson, L. F. (2002). Piano for pleasure: A basic course for adults (4th ed.). Schirmer/Cengage.
Citace podle Chicago (17th ed.)Hilley, Martha, a Lynn Freeman Olson. Piano for Pleasure: A Basic Course for Adults. 4th ed. Boston, Mass: Schirmer/Cengage, 2002.
Citace podle MLA (9th ed.)Hilley, Martha, a Lynn Freeman Olson. Piano for Pleasure: A Basic Course for Adults. 4th ed. Schirmer/Cengage, 2002.
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