The domain suffix of a website (the postscript at the end of a web address) can be a good indicator of the the website's authority and accuracy.
The following is a list of recommended credible websites. The websites do not replace content found in the CSU Online Library.
Resource created by Rationale, an argument mapping creator.
For a brief and comprehensible definition of critical thinking by Robert H. Ennis, Professor Emeritus, Univ. of Illinois.
The Center for Critical Thinking works under the auspices of the Foundation For Critical Thinking, an educational non-profit organization, to promote essential change in education and society through the cultivation of fairminded critical thinking.
This OpenCourseWare educational web site provides over 100 free online tutorials on critical thinking, logic, scientific reasoning, creativity, and other aspects of thinking skills. This resource is well worth exploring.