APA (7th ed.) Citation

Twaddell, W. F. (1935). On defining the phoneme. Waverly Press.

Chicago Style (17th ed.) Citation

Twaddell, William Freeman. On Defining the Phoneme. Baltimore: Waverly Press, 1935.

MLA (9th ed.) Citation

Twaddell, William Freeman. On Defining the Phoneme. Waverly Press, 1935.