Ford, J. L. (2008). Ruby programming for the absolute beginner. Thomson Course Technology PTR.
Lua i Stíl Chicago (17ú heag.)Ford, Jerry Lee. Ruby Programming for the Absolute Beginner. Boston: Thomson Course Technology PTR, 2008.
Lua MLA (9ú heag.)Ford, Jerry Lee. Ruby Programming for the Absolute Beginner. Thomson Course Technology PTR, 2008.
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