Hutchinson, T. (1991). English Project 1: Activity book (17th. ed.). Oxford University Press.
Cita Chicago (17th ed.)Hutchinson, Tom. English Project 1: Activity Book. 17th. ed. Oxford: Oxford University Press, 1991.
Cita MLA (9th ed.)Hutchinson, Tom. English Project 1: Activity Book. 17th. ed. Oxford University Press, 1991.
Atenció: Aquestes cites poden no estar 100% correctes.