National Council of Teachers of Mathematics, Kenney, M. J., & Hirsch, C. R. (1991). Discrete mathematics across the curriculum, K-12: 1991 yearbook. NCTM.
Citace podle Chicago (17th ed.)National Council of Teachers of Mathematics, Margaret J. Kenney, a Christian R. Hirsch. Discrete Mathematics Across the Curriculum, K-12: 1991 Yearbook. Reston, VA: NCTM, 1991.
Citace podle MLA (9th ed.)National Council of Teachers of Mathematics, et al. Discrete Mathematics Across the Curriculum, K-12: 1991 Yearbook. NCTM, 1991.
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