APA (7th ed.) Citation

Westphal, E. O. J. (1971). Vowel systems and X-Ray photography.

Chicago Style (17th ed.) Citation

Westphal, Ernst O. J. Vowel Systems and X-Ray Photography. 1971.

MLA (9th ed.) Citation

Westphal, Ernst O. J. Vowel Systems and X-Ray Photography. 1971.

Warning: These citations may not always be 100% accurate.