1. Language;Bloomfield,1984
2. The Phonology of Dutch;Booij,1995
3. Dialectology;Chambers,1998
4. Studies in r-klein. II. /r/ in hoofdtonige syllabe voor medeklinker [Studies in r-minor. II. /r/ in stressed syllable before a consonant];De Schutter;Taal en Tongval,1994
5. Foulkes, P., Docherty, G., 2001. Variation and change in British English /r/, in: Van de Velde, H., Van Hout, R. (Eds.), ‘r-atics. Sociolinguistic, Phonetic and Phonological Characteristics of /r/. [=Études & Travaux 4], Institut des Langues Vivantes et de Phonétique, Université Libre de Bruxelles, pp. 27–43.