501 Spanish Verbs by Christopher, Ph.D Kendris, Theodore N. Kendris (2003, Paperback)

I have the 5th edition of the 501 Spanish Verbs. Yes, its large, clocking in at over 670 pages but it seriously has every verb you could ever need in it, and a handy introduction to brief the reader on conjugation. From present to imperfect this guide is a great resource tool. My son is always using it to write his Spanish papers because sometimes when he takes the easy way out and uses the internet dictionary, it gives him the incorrect form of the verb. I wouldnt suggest carrying this book in your purse at all times so that when you hit a verb you dont know how to conjugate you can whip it out, but it is an excellent home or school resource. Hope I was helpful.