APA-viite (7. p.)

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

Chicago-viite (17. p.)

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

MLA-viite (9. p.)

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