Cita APA (7a ed.)

Wardhaugh, R. (1993). Investigating language: Central problems in linguistics. Blackwell.

Cita Chicago Style (17a ed.)

Wardhaugh, Ronald. Investigating Language: Central Problems in Linguistics. Oxford: Blackwell, 1993.

Cita MLA (9a ed.)

Wardhaugh, Ronald. Investigating Language: Central Problems in Linguistics. Blackwell, 1993.