Cita APA (7th ed.)
ebrary, Inc, Kügler, F., Féry, C., & Vijver, R. F. H. E. v. d. (2009). Variation and gradience in phonetics and phonology. Mouton de Gruyter.
Cita Chicago (17th ed.)
ebrary, Inc, Frank Kügler, Caroline Féry, i Ruben Florentius Hendricus Eduardus van de Vijver. Variation and Gradience in Phonetics and Phonology. New York, NY: Mouton de Gruyter, 2009.
Cita MLA (9th ed.)
ebrary, Inc, et al. Variation and Gradience in Phonetics and Phonology. Mouton de Gruyter, 2009.
Atenció: Aquestes cites poden no estar 100% correctes.