Ramírez Salas, M. (2005). Grouping techniques in an EFL classroom. Universidad de Costa Rica.
Chicago-čujuhus (17. p.)Ramírez Salas, Marlene. Grouping Techniques in an EFL Classroom. Universidad de Costa Rica, 2005.
MLA-čujuhus (9. p.)Ramírez Salas, Marlene. Grouping Techniques in an EFL Classroom. Universidad de Costa Rica, 2005.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.