Harry Gensler 
Introduction to Logic [PDF ebook] 

Introduction to Logic offers one of the most clear, interesting and accessible introductions to what has long been considered one of the most challenging subjects in philosophy. Harry Gensler engages students with the basics of logic through practical examples and important arguments both in the history of philosophy and from contemporary philosophy. Using simple and manageable methods for testing arguments, students are led step-by-step to master the complexities of logic.
The companion Logi Cola instructional program and various teaching aids (including a teacher»s manual) are available from the book»s website: www.routledge.com/textbooks/gensler_logic