APA
Nielsen F., Folstrom R., . (1969). Music fundamentals. Reading, Mass: .
Chicago
Nielsen F, Folstrom R.J, . 1969. Music fundamentals. Reading, Mass: .
Harvard
Nielsen F., Folstrom R., . (1969). Music fundamentals. Reading, Mass: .
MLA
Nielsen F, Folstrom R.J, . Music fundamentals. Reading, Mass: . 1969.