Kris Acheson-Clair created this post
Mezirow (1991) - Foundational source
This one is not open source - you'll need to find it in your nearest library or purchase it online. If you are interested in learning more about TL Theory, this is where it all began.
Citation (APA): Mezirow, J. (1991). Transformative dimensions of adult learning. San Francisco, CA: JosseyBass