Cita APA (7a ed.)

Heffner, R., & Twaddell, W. (1960). General Phonetics (3rd print.). The University of Wisconsin Press.

Cita Chicago Style (17a ed.)

Heffner, R.M.S, y W.F Twaddell. General Phonetics. 3rd print. Madison: The University of Wisconsin Press, 1960.

Cita MLA (9a ed.)

Heffner, R.M.S, y W.F Twaddell. General Phonetics. 3rd print. The University of Wisconsin Press, 1960.