MLA

Smith, Robert, and James Murray Barbour. Harmonics : Or The Philosophy of Musical Sounds. An unabridged republication of the first edition New York: Da Capo Press, 1966.

APA

Smith, R., & Barbour, J. Murray. (1966). Harmonics : Or The philosophy of Musical Sounds. An unabridged republication of the first edition New York: Da Capo Press.

Chicago

Smith, Robert, and James Murray Barbour. Harmonics: Or The Philosophy of Musical Sounds. An unabridged republication of the first edition New York: Da Capo Press, 1966.