Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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