Gerngross, G., & Puchta, H. Playway to english: Pupil's book 1.
Cita Chicago (17th ed.)Gerngross, Günter, i Herbert Puchta. Playway to English: Pupil's Book 1.
Cita MLA (8th ed.)Gerngross, Günter, i Herbert Puchta. Playway to English: Pupil's Book 1.
Atenció: Aquestes cites poden no estar 100% correctes.