Riddell, A. R. (1991). What causes differences in achievement in Zimbabwe's secondary schools? Population and Human Resources, World Bank.
Citace podle Chicago (17th ed.)Riddell, Abby Rubin. What Causes Differences in Achievement in Zimbabwe's Secondary Schools? [Washington, D.C.]: Population and Human Resources, World Bank, 1991.
Citace podle MLA (9th ed.)Riddell, Abby Rubin. What Causes Differences in Achievement in Zimbabwe's Secondary Schools? Population and Human Resources, World Bank, 1991.
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