APA (7th ed.) Citation

Fasold, R. W., & Schiffrin, D. (1989). Language change and variation. John Benjamins.

Chicago Style (17th ed.) Citation

Fasold, Ralph W., and Deborah Schiffrin. Language Change and Variation. Amsterdam [etc.]: John Benjamins, 1989.

MLA (9th ed.) Citation

Fasold, Ralph W., and Deborah Schiffrin. Language Change and Variation. John Benjamins, 1989.