Reference Books:

Bicknell, T.P. and F. Trotman -- How to Write & Illustrate Children's Books
Children's Writers & Illustrators Market (annual publication)
Garland, Sherry. Writing for Young Adults
Gates, Frieda. How to Write, Illustrate & Design Children's Books
Giblin, James Cross. Writing Books for Young People
Irwin, Harley & Jeanette Eyerly. Writing Young Adult Books
Karl, Jean E. How to Write & Sell Children's Picture Books
Roberts, Ellen. The Children's Picture Book: how to Write it, How to Sell It
Sueling, Barbara. How to Write a Children's Book & Get It Published.
Woods, Bruce (ed.) The Basics of Writing for children & Young Adults
Woolley, Catherine. Writing for Children.
Wyndham, Lee & Arnold Madison. Writing for Children and Teenagers
Yolen, Jane. Guide to Writing for Children
Zinsser, William (ed.). The Art & Craft of Writing for Children.