This book was created by combining two previous books on logic and critical thinking, both made available under a Creative Commons license, and then adding some material so that the coverage matched that of commonly used logic textbooks.
J. Robert Loftis
University at Albany
P.D. Magnus, Cathal Woods, and J. Robert Loftis, “For All X; The Lorain County Remix,” Open Educational Resource (OER) , accessed October 25, 2020, http://oer.iain-padangsidimpuan.ac.id/items/show/138.