Book excerpt: Nominal Arguments in Language Variation investigates nominal arguments in classifier languages, refuting the long-held claim that classifier languages do not have overt article determiners. Li Julie Jiang brings the typologically unique Nuosu Yi, a classifier language that has an overt definite determiner (D), to the forefront of the theoretical investigation. By comparing nominal arguments in Nuosu Yi to those in Mandarin, a well-studied classifier language that has no overt evidence of an article determiner, Jiang provides new accounts of variation among classifier languages and extends the parameters to argument formation in general. In addition to paying particular attention to these two classifier languages, the discussion of nominal arguments also covers a wider range of classifier languages and number marking languages from Romance, Germanic, and Slavic to Hindi. Using a broad cross-linguistic perspective and detailed empirical analysis, Nominal Arguments in Language Variation is an important contribution to research on classifier languages and the fields of theoretical syntax, semantics, language variation, and linguistic typology.