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· 1970
- Richard Yorkey
· 1984
- Richard Yorkey
· 1984
- Anna Uhl Chamot, Joan Baker-Gonzalez, Isobel Rainey De Diaz, Richard C Yorkey, Isobel Rainey de Diaz, Richard Yorkey
· 1990
Gradual but secure development of all four skills emphasizes meaningful communication in a natural context.