Colby, F. O. (1964). University pronouncing dictionary of troublesome words. New York: Thomas Y. Crowell Company.
Παραπομπή Chicago StyleColby, Frank O. University Pronouncing Dictionary of Troublesome Words. New York: Thomas Y. Crowell Company, 1964.
Παραπομπή MLAColby, Frank O. University Pronouncing Dictionary of Troublesome Words. New York: Thomas Y. Crowell Company, 1964.
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