American dialect research / ed. by Dennis R. Preston ; with the assistance of the members of the committee John G. Fought ... [et al.] ; and the distinguished honorary members of the committee Dwight Bolinger and Charles F. HocketSecond language acquisition and linguistic variation / ed. by Robert Bayley, Dennis R. PrestonHandbook of perceptual dialectologyHandbook of perceptual dialectologyVariation in indigenous minority languages / ed. by James N. Stanford, Dennis R. Preston