RT Journal Article SR Electronic(1) A1 Groot, P.J.M. YR 1991 T1 Besprekingsartikel John H.A.L. de Jong: "Defining a Variable of Foreign Language Ability" an Application of Item Response Theory. JF Toegepaste Taalwetenschap in Artikelen VO 41 IS 1 SP 67 OP 74 DO https://doi.org/10.1075/ttwia.41.06gro PB John Benjamins SN 0169-7420, AB , UL https://www.jbe-platform.com/content/journals/10.1075/ttwia.41.06gro