Cita APA (7th ed.)

Doff, A., Jones, C. J., & Mitchell, K. Meanings into words. Intermediate. An integrated course for students of English. Test book.

Cita Chicago (17th ed.)

Doff, Adrian, Christopher J. Jones, i Keith Mitchell. Meanings into Words. Intermediate. An Integrated Course for Students of English. Test Book.

Cita MLA (8th ed.)

Doff, Adrian, et al. Meanings into Words. Intermediate. An Integrated Course for Students of English. Test Book.