Hafstrom, J. E. (1963). Basic concepts in modern mathematics (2a. ed.). Addison - Wesley Publishing Company, Inc..
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Chicago-čujuhus (17. p.)
Hafstrom, John E. Basic Concepts in Modern Mathematics. 2a. ed. Addison - Wesley Publishing Company, Inc., 1963.
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MLA-čujuhus (9. p.)
Hafstrom, John E. Basic Concepts in Modern Mathematics. 2a. ed. Addison - Wesley Publishing Company, Inc., 1963.
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