Lapointe, A., Phillips, G. W., & Mead, N. A. (1989). A world of differences: An international assessment of mathematics and science. Educational Testing Service.
Citace podle Chicago (17th ed.)Lapointe, Archie, Gary W. Phillips, a Nancy A. Mead. A World of Differences: An International Assessment of Mathematics and Science. [Princeton, N.J.]: Educational Testing Service, 1989.
Citace podle MLA (8th ed.)Lapointe, Archie, et al. A World of Differences: An International Assessment of Mathematics and Science. Educational Testing Service, 1989.
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