Cita APA (7a ed.)

TREGIDGO, P. Practical English usage for overseas: Students (2nd ed.). Longman.

Cita Chicago Style (17a ed.)

TREGIDGO, P.S. Practical English Usage for Overseas: Students. 2nd ed. London: Longman.

Cita MLA (9a ed.)

TREGIDGO, P.S. Practical English Usage for Overseas: Students. 2nd ed. Longman.