If you're in doubt, the APA recommends keeping in mind the question of how you will get readers to the source. -- Asking the Right Question: How Can the Reader Find the Source? on the APA Style Blog.
Grundy, J., & Hosking, J. (2002). Developing adaptable user interfaces for component-based systems. Interacting with Computers, 14(3), 175-194. doi: 10.1016/s0953-5438(01)00049-2
Stephanidis, C. (2001). User interfaces for all : concepts, methods, and tools. Mahwah, NJ: Lawrence Erlbaum Associates Inc.
Akoumianakis, D., Grammenos, D., & Stephanidis, C. (2001). User interface adaptation: Evaluation perspectives. In C. Stephanidis (Ed.), User interfaces for all: Concepts, methods, and tools (pp. 339-352). Mahwah, NJ, US: Lawrence Erlbaum Associates Publishers.
Stuerzlinger, W., Chapuis, O., Phillips, D., & Roussel, N. (2006). User interface facades: towards fully adaptable user interfaces. Paper presented at the Proceedings of the 19th annual ACM symposium on User interface software and technology, Montreux, Switzerland.
Often one of these pieces of information is missing. Take a look at this handy chart from the APA (pdf) for help in figuring out what to do in those situations.
Lee, C. (November 18, 2010). How to cite something you found on a website in APA style [blog post]. Retrieved from http://blog.apastyle.org/apastyle/2010/11/how-to-cite-something-you-found-on-a-website-in-apa-style.html
* Note: you only need to give the format if it's something out of the ordinary. You don't need to add it for a regular webpage or article.
Have a question about citing a weird source, or formatting something tricky in APA? The APA Style Blog has all sorts of great information and explanations of APA 6th.
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