Wikipedia is the ideal place to start your research and get a global picture of a topic, however (..) it's usually not advisable, particularly at the university level, to cite an encyclopedia[1]
Ultrastudio.org is a tertiary source that aims to provide short and clear introduction to the subject. We assume that the reader that is initially unaware (or little aware) about the subject and at the end of reading enough information should be given to understand the basic concepts. Interactive demos also lower the start of the learning curve. This way we are different from most of the textbooks (that should focus on completeness of coverage) and especially from review or research articles (that focus on formal correctness). Ultrastudio.org article and demonstration should be usable alone, but they are not replacement for more advanced texts for a student who wants to earn for living on that knowledge. For instance:
We also have a policy to avoid copying too much content from any single site, also when permitted by the license. It is better to create efficient summary and generalization from several sources. The same is true for applets: we try to collect them from various sources rather than taking everything we found from any single site. We expect to "feed" good sites that way, providing traffic for them through reference links. People may follow because we say clearly there are more relevant applets there.
We do not recommend to cite Ultrastudio.org or any other encyclopedia in your diploma work or other similar publication. For the serious work, it is better to look into references and cite them where appropriate. Even review article in peer reviewed journal is not a good entry for citation as the competent reader should to look into original sources.
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