Alpert, S. R., Brown, K., & Woolf, B. (1998). The design patterns Smalltalk companion. Addison-Wesley.
Cita Chicago Style (17a ed.)Alpert, Sherman R., Kyle Brown, y Bobby Woolf. The Design Patterns Smalltalk Companion. Reading, Massachusetts: Addison-Wesley, 1998.
Cita MLA (8a ed.)Alpert, Sherman R., et al. The Design Patterns Smalltalk Companion. Addison-Wesley, 1998.
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