De Schiffrin, R. (1971). English - My second language. Longman.
Cita Chicago (17th ed.)De Schiffrin, R.S. English - My Second Language. London: Longman, 1971.
Cita MLA (9th ed.)De Schiffrin, R.S. English - My Second Language. Longman, 1971.
Atenció: Aquestes cites poden no estar 100% correctes.