Campbell, M. (1992). Harward graphics 3 0 a su alcance. Mc Graw Hill.
Chicago-čujuhus (17. p.)Campbell, Mary. Harward Graphics 3 0 a Su Alcance. Mc Graw Hill, 1992.
MLA-čujuhus (9. p.)Campbell, Mary. Harward Graphics 3 0 a Su Alcance. Mc Graw Hill, 1992.
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