Wicca is a religion formulated by Gerald Gardner, and others,less than a hundred years ago. It, very loosely, has elements of witchcraft.
Pagan is any belief that is not of a mainstream religion, or of none!
Wicca is an earth-based mystery religion, which was formed from various sources (Thelema, Golden Dawn, The Goetia and Clavicula Salomonis, as well as native British and European religions, such as Celtic practice) in the (estimated) 1930's - 1940's and brought into the public eye by Gerald Gardner with the publication of his "fiction" work, High Magic's Aid in 1949, published under the pseudonym of Scire. In 1954, following the repeal of the Witchcraft Act in England, he published a further work, namely Witchcraft Today. Thus the religion was brought firmly into the public eye.
Wicca in it's original form is an initiatory, Mystery religion, which is oath-bound, practiced in a coven and is a priesthood. With the rise in popularity of Wicca through popular culture and the increase in publications on the subject, it is now fair to say that there is Wicca and a number of paths based on Wicca. Wicca itself remains the initiatory form and the latter comprises those paths inspired by the first form, which are not necessarily initiatory but are often solitary or eclectic and often involves a self-dedication ritual by the practitioner to their chosen deities.
Lark's post is correct. Wicca has changed so much over the years that Gerald Gardner wouldn't recognise it! But quite a few of the original founders of Wicca are still alive. Patricia Crowther and Maxine Sanders, to name but two!
To start with, here are some books that I would suggest.
''A Witch Alone'' by Marian Green
''The Elements of Ritual'' by Deborah Lipp
''Witchcrafting'' by Phyllis Curott
''21st Century Wicca'' by Jennifer Hunter
''Before You Cast a Spell'' by Carl McColman
''When, Why...If'' by Robin Wood
''Practical Pagan'' by Dana Eilers
''Wicca; A Year and a Day'' by Timothy Roderick
You can also find the recommended reading list that my coven uses at: http://www.tangledmoon.org/reading_list.htm
Here's some websites that you may find useful in helping you with questions.
http://www.tangledmoon.org (this is my own coven site.)
Hope this helps you get a good start on your studies. And feel free to ask me, or the others here on the board if you have any specific questions we can help you with.
Perhaps you meant the book "Green Witchcraft"? "Green Witchcraft" was written by Ann Moura and is about one form of witchcraft, but it is not about Wicca.
