Gerngross, G., & Puchta, H. Playway to english: Teacher´s guide 2.
Cita Chicago (17th ed.)Gerngross, Günter, i Herbert Puchta. Playway to English: Teacher´s Guide 2.
Cita MLA (8th ed.)Gerngross, Günter, i Herbert Puchta. Playway to English: Teacher´s Guide 2.
Atenció: Aquestes cites poden no estar 100% correctes.