Impey, G., & Underhill, N. (1994). The ELT manager's handbook: Practical advice on managing a successful language school. Heinemann English Language Teaching.
Lua i Stíl Chicago (17ú heag.)Impey, Graham, agus Nic Underhill. The ELT Manager's Handbook: Practical Advice on Managing a Successful Language School. Oxford: Heinemann English Language Teaching, 1994.
Lua MLA (8ú heag.)Impey, Graham, agus Nic Underhill. The ELT Manager's Handbook: Practical Advice on Managing a Successful Language School. Heinemann English Language Teaching, 1994.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.