Open Textbook Proof-of-Concept via ConnexionsBaker, J., Thierstein, J., Fletcher, K., Kaur, M., & Emmons, J. (2009). Open Textbook Proof-of-Concept via Connexions. The International Review Of Research In Open And Distance Learning, 10(5). Retrieved from http://www.irrodl.org/index.php/irrodl/article/view/633/1390