Trask, R. (1999). Language: The basics (2nd ed.). Routledge.
Cita Chicago (17th ed.)Trask, R.L. Language: The Basics. 2nd ed. London: Routledge, 1999.
Cita MLA (9th ed.)Trask, R.L. Language: The Basics. 2nd ed. Routledge, 1999.
Atenció: Aquestes cites poden no estar 100% correctes.