Citazione APA

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

Stile di citazione Chicago

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

Citazione MLA

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

Attenzione: Queste citazioni potrebbero non essere precise al 100%.