Watcyn-Jones, P. (2003). Longman English interactive 1: Communication companion. Pearson.
Cita Chicago (17th ed.)Watcyn-Jones, Peter. Longman English Interactive 1: Communication Companion. White Plains: Pearson, 2003.
Cita MLA (8th ed.)Watcyn-Jones, Peter. Longman English Interactive 1: Communication Companion. Pearson, 2003.
Atenció: Aquestes cites poden no estar 100% correctes.