Verbs not used in progressive forms

http://www.englishpractice.com/grammar/verbs-progressive-forms/

http://www.englishcoursemalta.com/learn/english-verbs-that-cannot-be-used-in-the-continuous-or-progressive-form/

http://www.englishpage.com/verbpage/types.html

http://www.eslmonster.com/article/non-continuous-verbs

http://vickycondrat.wordpress.com/grammar-sos/verb/continuously-present-in-present-continuous/verbs-not-normally-used-in-the-continuous-form/

https://learnenglish.britishcouncil.org/en/grammar-reference/stative-verbs

https://www.englishclub.com/grammar/verbs-m_vmwct_1.htm

http://esl.about.com/od/grammarintermediate/a/noncontinuous.htm

http://www.ecenglish.com/learnenglish/lessons/non-continuous-verbs

http://www.englishpage.com/verbpage/presentcontinuous.html

http://www.englishcoursemalta.com/learn/english-verbs-that-cannot-be-used-in-the-continuous-or-progressive-form