These are some great books, to help you learn more about Butterflies, Moths and related insects.

by Deborah Heiligmam
From the time a caterpillar first hatches, it eats so fast that its skin can't keep up. It sheds its skin several times as it grows bigger and bigger. Eventually it forms a chrysalis and one day splits open and a beautiful butterfly emerges. What a magical metamorphosis!

Butterflies Through Binoculars : The East - Jeffery Glassberg  
For butterfly enthusiasts, for bird watchers who want to add a new dimension to their hobby, for anyone who is simply interested in exploring the wilds of their own back yard, this new field guide offers hours of delightful help and instruction Through Binoculars

by John Dennis and Mathew Tekulsky
Ortho Books. It has lots of inspiring pictures

This guide to butterflies includes 75 of the most common species found in Britain and Northern Europe. Each of the main species is illustrated together with a distribution map and a detailed description of identification features, habitat and life history.

By Paul Hicks
An illustrated introduction on how to photograph insects, butterflies and moths.

by Robert Michael Pyle, Sarah Anne Hughes
Where to find butterflies; how to observe them and photograph them; their behavior, biology, ecology, and life histories; butterfly gardening; butterfly rearing; identification; and conservation. Beautifully written and beautifully illustrated

National Audubon Society Field Guide to North American Butterflies

By Robert Michael Pyle
Butterflies are among the natural world's most colorful and intriguing creatures, so what could be more useful than a handy field guide with more than 1,000 photographs of all the butterflies of North America north of Mexico, including all true butterflies, the most common skippers, and many migrants and strays. The color plates are visually arranged by shape and color, and thumb-tab silhouettes provide a convenient index to identification of butterflies in the field. The species account for each butterfly provides measurements, descriptions of each stage of the life cycle, and information on coloring or distinguishing markings, flight period, habitat, and range.