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Testing the discriminant validity of Schwartz' portrait calue questionnaire items: a replication and extension of Knoppen and Saris (2009) [journal article]
Source: Survey Research Methods, 6 (2012) 1. p.25-36
Introduction to the special issue on Results, Methodological Aspects, and Advancements of the Programme for the International Assessment of Adult Competencies (PIAAC) [journal article]
Source: Large-scale Assessments in Education, 6 (2018)