1. Bing Synonyms API. https://datamarket.azure.com/dataset/bing/synonyms. Bing Synonyms API. https://datamarket.azure.com/dataset/bing/synonyms.
2. Dictionary and Thesaurus - Merriam-Webster Online. http://www.merriam-webster.com/. Dictionary and Thesaurus - Merriam-Webster Online. http://www.merriam-webster.com/.
3. Microsoft solver foundation. http://msdn.microsoft.com/en-us/library/ff524509.aspx. Microsoft solver foundation. http://msdn.microsoft.com/en-us/library/ff524509.aspx.
4. Satori. http://news.cnet.com/8301--10805_3--57596042--75/microsofts-bing-seeks-enlightenment-with-satori/. Satori. http://news.cnet.com/8301--10805_3--57596042--75/microsofts-bing-seeks-enlightenment-with-satori/.
5. Wiktionary. http://www.wiktionary.org/. Wiktionary. http://www.wiktionary.org/.