Coba jelasin Lihat pula dari Rotisitas bahasa Inggris dong

Labov, William, Sharon Ash, and Charles Boberg. 2006. The Atlas of North American English. Berlin: Mouton de Gruyter. ISBN 3-11-016746-8.

Pollock, K., et al. 1998. "Phonological Features of African American Vernacular English (AAVE)". Accessed March 24, 2007.

Wells, J. C. Accents of English. 3 vols. Cambridge: Cambridge University Press, 1982.

Chapter 7 of the Atlas of North American English by William Labov et al., dealing with rhotic and non-rhotic accents in the U.S. (PDF file)

Rhotic vs non-rhotic, intrusive "r" from the alt.usage.english newsgroup's FAQ

Rhotic or non-rhotic English? , Pétur Knútsson, University of Iceland

'Hover & Hear' accents of English from around the world , both rhotic and non-rhotic.