Nyagura, L. M., & Riddell, A. (1993). Primary school achievement in English and mathematics in Zimbabwe: A multi-level analysis. Financial Sector Development Dept., World Bank.
Παραπομπή σε μορφή Chicago (17η εκδ.)Nyagura, Levi M., και Abby Riddell. Primary School Achievement in English and Mathematics in Zimbabwe: A Multi-level Analysis. Washington, DC: Financial Sector Development Dept., World Bank, 1993.
Παραπομπή σε μορφή MLA (9th εκδ.)Nyagura, Levi M., και Abby Riddell. Primary School Achievement in English and Mathematics in Zimbabwe: A Multi-level Analysis. Financial Sector Development Dept., World Bank, 1993.
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