Ramírez Salas, M. (2004). English Teachers as materials developers. Universidad de Costa Rica.
Lua i Stíl Chicago (17ú heag.)Ramírez Salas, Marlene. English Teachers as Materials Developers. Universidad de Costa Rica, 2004.
Lua MLA (9ú heag.)Ramírez Salas, Marlene. English Teachers as Materials Developers. Universidad de Costa Rica, 2004.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.