APA (7th ed.) Citation

Perger Ilona & Kristó László. (2010). Classifications of English vowels.

Chicago Style (17th ed.) Citation

Perger Ilona and Kristó László. Classifications of English Vowels. 2010.

MLA (8th ed.) Citation

Perger Ilona and Kristó László. Classifications of English Vowels. 2010.

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