Gudwin, R., & Queiroz, J. (2007). Semiotics and intelligent systems development. Hershey, PA : Idea Group Pub..
Lua i Stíl Chicago (17ú heag.)Gudwin, Ricardo, agus Joao Queiroz. Semiotics and Intelligent Systems Development. Hershey, PA : Idea Group Pub., 2007.
Lua MLA (9ú heag.)Gudwin, Ricardo, agus Joao Queiroz. Semiotics and Intelligent Systems Development. Hershey, PA : Idea Group Pub., 2007.
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