Cita APA (7th ed.)

Thomson, A. J., & Martinet, A. V. Auxiliary verbs (8a ed.).

Cita Chicago (17th ed.)

Thomson, A. J., i A. V. Martinet. Auxiliary Verbs. 8a ed.

Cita MLA (8th ed.)

Thomson, A. J., i A. V. Martinet. Auxiliary Verbs. 8a ed.