Cita APA (7th ed.)

Thomson, A. J., & Martinet, A. V. Present and past tenses (10 ed.).

Cita Chicago (17th ed.)

Thomson, A. J., i A. V. Martinet. Present and Past Tenses. 10 ed.

Cita MLA (8th ed.)

Thomson, A. J., i A. V. Martinet. Present and Past Tenses. 10 ed.