APA aipamena

Preston, D. R., & Roger W. Shuy. (1988). Varieties of American English: Teacher's handbook. D.C.: U.S. Information Agency.

Chicago Style aipamena

Preston, Dennis R., và Roger W. Shuy. Varieties of American English: Teacher's Handbook. D.C.: U.S. Information Agency, 1988.

MLA aipamena

Preston, Dennis R., và Roger W. Shuy. Varieties of American English: Teacher's Handbook. D.C.: U.S. Information Agency, 1988.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.