Παραπομπή APA

Preston, D. R., & Shuy, R. W. (1988). Varieties of American English: Teacher's handbook. Washington, DC.: Department of state.

Παραπομπή Chicago Style

Preston, Dennis R., και Roger W. Shuy. Varieties of American English: Teacher's Handbook. Washington, DC.: Department of state, 1988.

Παραπομπή MLA

Preston, Dennis R., και Roger W. Shuy. Varieties of American English: Teacher's Handbook. Washington, DC.: Department of state, 1988.

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