You may also be interested in the following books:
- Natural Deduction
An Introduction to Logic with Real Arguments, a Little History, and Some Humour
Natural Deduction has a companion website containing additional solution sets for each chapter.
The access code to this website is included with all new copies. If you purchased a used copy or you are missing your passcode for this site, you may purchase one online from this webpage. Once you have completed the order process, you will receive an email containing a passcode.