APA-referens (7:e uppl.)

Wardhaugh, R. (1977). Introduction to linguistics (2nd ed.). McGraw-Hill.

Chicago-referens (17:e uppl.)

Wardhaugh, Ronald. Introduction to Linguistics. 2nd ed. New York: McGraw-Hill, 1977.

MLA-referens (9:e uppl.)

Wardhaugh, Ronald. Introduction to Linguistics. 2nd ed. McGraw-Hill, 1977.