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Research on the comparability of the oral proficiency inter..:

Stansfield, Charles W ; Mann Kenyon, Dorry
System : an international journal of educational technology and applied linguistics.  20 (1992)  3 - p. 347-364 , 1992
Exemplar:  Zentrale:Magazin Zs fe 6111; Zentrale:Magazin Zs fe 6111