Ramírez Salas, M. (2004). English Teachers as materials developers. Universidad de Costa Rica.
Chicago-viite (17. p.)Ramírez Salas, Marlene. English Teachers as Materials Developers. Universidad de Costa Rica, 2004.
MLA-viite (9. p.)Ramírez Salas, Marlene. English Teachers as Materials Developers. Universidad de Costa Rica, 2004.
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