I've collected many books on gardening from second-hand stores like goodwill. The Rodale's and the Home and Garden books are thorough, currently I'm using "The New Victory Garden" by Bob Thompson to plan my garden which organizes the chapters by tasks for each month. I'm also interested in edible perennial gardening; my favorite book is "Creating a Forest Garden" by Martin Crawford which has a great plant encyclopedia with ratings and guides for design and planting. If you have a little extra room and want to incorporate beautiful landscapes while growing food, it's well worth a look.