Wirth, Niklaus (2001). «Program Development by Stepwise Refinement». En Broy, Manfred; Denert, Ernst, eds. Pioneers and Their Contributions to Software Engineering. Berlin, Heidelberg: Springer. ISBN978-3642483554. S2CID11348419. doi:10.1007/978-3-642-48354-7.
Wirth, Niklaus (2001). «Program Development by Stepwise Refinement». En Broy, Manfred; Denert, Ernst, eds. Pioneers and Their Contributions to Software Engineering. Berlin, Heidelberg: Springer. ISBN978-3642483554. S2CID11348419. doi:10.1007/978-3-642-48354-7.
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«Niklaus Wirth has died». Hacker News(en inglés). 3 de enero de 2024. Consultado el 3 de enero de 2024.