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              Hampf, F., Wiederhold, S., & Woessman, L. (2017). Skills, earnings, and employment: Exploring causal- ity in the estimation of returns to skills. Large-scale Assessments in Education, 5, Art. 12. Retrieved 2 January 2020 from https ://doi.org/10.1186/s4053 6-017-0045-7.
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              Hampf, F., Wiederhold, S., Woessman, L. (2017). Skills, earnings, and employment: Exploring causal- ity in the estimation of returns to skills. Large-scale Assessments in Education, 5.
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