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Text For Scheme: How to Design Programs by Felleisen et al. QA76.6 .H697 2001 (Available online; no purchase is necessary.)
DrScheme/DrRacket: Please download and use the DrScheme/DrRacket system available from the PLT Scheme web Racket download site. To avoid compatibility problems, please make sure you use a Version numbered 4.2.x. As of 2-1-10, the latest version is 4.2.4, which fixes some bugs in 4.2.35.0.2.
Notes for Java: Object-oriented Design
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