There are lots of fantastic knitting and crochet books available–way too many to list! Here are some of my favorites.

Increase Decrease
Increase Decrease by Judith Durant
Available from your local yarn shop, independent bookseller, Barnes & Noble, or Amazon
TheKnittingAnswerBook
The Knitting Answer Book by Margaret Radcliffe
Available from your local yarn shop, independent bookseller, Barnes & Noble, or Amazon
TheKnowledgeableKnitter
The Knowledgeable Knitter by Margaret Radcliffe
Available from your local yarn shop, independent bookseller, Barnes & Noble, or Amazon
KnitwearDesignWorkshop
Knitwear Design Workshop by Shirley Paden
Available from your local yarn shop, independent bookseller, Barnes & Noble, or Amazon
TheCrochetersSkillBuildingWorkshop
The Crocheter's Skill-Building Workshop by Dora Ohrenstein
Available from your local yarn shop, independent bookseller, Barnes & Noble, or Amazon
One-SkeinWonders
One-Skein Wonders by Judith Durant
Available from your local yarn shop, independent bookseller, Barnes & Noble, or Amazon
ATreasuryofKnittingPatterns
A Treasury of Knitting Patterns by Barbara G. Walker
Available from your local yarn shop, independent bookseller, Barnes & Noble, or Amazon
ASecondTreasuryofKnittingPatterns
A Second Treasury of Knitting Patterns by Barbara G. Walker
Available from your local yarn shop, independent bookseller, Barnes & Noble, or Amazon
ChartedKnittingDesigns
Charted Knitting Designs: A Third Treasury of Knitting Patterns by Barbara G. Walker
Available from your local yarn shop, independent bookseller, Barnes & Noble, or Amazon
AFourthTreasuryofKnittingPatterns
A Fourth Treasury of Knitting Patterns by Barbara G. Walker
Available from your local yarn shop, independent bookseller, Barnes & Noble, or Amazon
EntreetoEntrelac
Entree to Entrelac by Gwen Bortner
Available from your local yarn shop, independent bookseller, Barnes & Noble, or Amazon
Indispensable Stitch Dictionary for Crocheters
Indispensable Stitch Dictionary for Crocheters by Melissa Leapman
Available from your local yarn shop, independent bookseller, Barnes & Noble, or Amazon