A LOGIC PRIMER A Little Logic by Dr. James B. Sauer. This is the easiest to understand, and therefore best, primer I've come across so far -- especially for those first dipping their toes in logic and its terms. There are several typo-grade errors in the text; you might want to correct these before passing out to students.
Introduction to Logic by Stefan Waner and Steven R. Costenoble. A tutorial with built-in questions.
"This on-line text is, for the most part, devoted to the study of so-called Propositional Calculus. Contrary to what the name suggests, this has nothing to do with the subject most people associate with the word "calculus." Actually, the term "calculus" is a generic name for any area of mathematics that concerns itself with calculating. For example, arithmetic could be called the calculus of numbers. Propositional Calculus is then the calculus of propositions. A proposition, or statement, is any declarative sentence which is either true (T) or false (F). We refer to T or F as the truth value of the statement."
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