Selected Resources
This is a very selective list, and doesn't purport to be anything beyond a few titles from my extensive library of art technique books, supplemented by several online learning resources I have experience with.
Books
ATCs
Berlin, Bernie. Artist Trading Card Workshop: Create Collect Swap. North Light Books, 2007. ISBN 978-1-58180-848-3
Bolton, Patricia. 1000 Artist Trading Cards: Innovative and Inspired Mixed-Media ATCs. Quarry, 2007. ISBN 978-1-59253-334-3
Vollrath, Lisa, Michele Charles and Jim Holtz. Trading Cards Techniques & ATCs. Design Originals, 2005. ISBN 1-57421259-1
Artist Books
Golden, Alisa. Making Handmade Books: 100+ Bindings, Structures & Forms. Lark Crafts, 2010. ISBN 978-1-60059-587-5
Tourtillott, Suzanne J. E. 500 Handmade Books: Inspiring Interpretations of a Timeless Form. Lark Crafts, 2008. ISBN 978-1-57990-877-5 (There is also a volume 2 published in 2013. ISBN 978-1-4547-0753-0)
Wasserman, Krystyna. The Book as Art: Artists Books from the National Museum of Women in the Arts. Princeton Architectural Press, 2007. ISBN 978-1-56898-609-8
Pastels
*Creevy, Bill. The Pastel Book.: Materials and Techniques for Today's Artists. Watson-Guptill, 1999. ISBN 978-0823039050
Harrison, Hazel. Pastel School. Reader's Digest, 1996. ISBN 0-7621-0698-0
*Kahn, Wolf. Wolf Kahn Pastels. Abrams, 2000. ISBN 978-0-8109-6707-6. In a series of essays, the artist explores the capacities and the challenges of working in the medium. Full-color reproductions of his gorgeous pastels.
Martin, Judy. The Encyclopedia of Pastel in Techniques. Sterling, 2003. ISBN 1-4027-0911-0
Watercolor
Dewey, David. The Watercolor Book: Materials and Techniques for Today's Artist. Watson-Guptill, 1995. ISBN 0-8230-5639-2
Additional Media
Bess, Joan. Gelli Plate Printing: Mixed-Media Monoprinting without a Press. North Light, 2014. ISBN 978-1-4403-3548-8
Online Resources
Pastels
Colin Bradley School of Art. You might want to start on the page showing his free classes and try one out if interested. He works a great deal with pastel pencils. Having never used pastels or pastel pencils before, I took several of these classes and was amazed at the finished works.
Watercolor
In the Studio with Michele Webber. I have found her many watercolor YouTube videos very helpful.
Books marked with an asterisk are recommended by Mary Pritchard, an award-winning pastel artist.