Goetschius, P. (1938). Exercise in elementary counterpoint. G. Schirmer, Inc..
Chicago-čujuhus (17. p.)Goetschius, Percy. Exercise in Elementary Counterpoint. New York: G. Schirmer, Inc., 1938.
MLA-čujuhus (9. p.)Goetschius, Percy. Exercise in Elementary Counterpoint. G. Schirmer, Inc., 1938.
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