DREWS, D. A. e. a. (1979). Tandem: Language in action series skills reinforcement (teacher's edition). National Textbook.
Lua i Stíl Chicago (17ú heag.)DREWS, Donna Anthony et all. Tandem: Language in Action Series Skills Reinforcement (teacher's Edition). Skokie: National Textbook, 1979.
Lua MLA (9ú heag.)DREWS, Donna Anthony et all. Tandem: Language in Action Series Skills Reinforcement (teacher's Edition). National Textbook, 1979.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.