Books

Bosch, J. and W. Kemp. 2001. How to Manage the Blue Orchard Bee, Sustainable Ag. Network Handbook series, Book 5.
This book has excellent color photos, lots of details, and especially good sections on parasites and predators, and on incubation and emergence.  Excellent if you know these bees; a bit technical for a beginner.
Now available free in PDF format at the SARE website:  http://www.sare.org/publications/bob.htm

Dogterom, M.  2002, revised 2009.  Pollination with Mason Bees.  BEEDIVERSE™ BOOKS 
$16.45 U.S.  plus shipping and handling.  
Black and white drawings, all of the basics of Osmia management plus information on other kinds of bees.  If you are just discovering orchard bees, this is a great book to start with.  Also contains a discussion of loose cocoon management, particularly useful for controlling hairy-fingered mites (they don't affect honeybees).
Click to order.

Griffin, Brian L. 1993. The Orchard Mason Bee. Knox Cellars Publishing.

Wright, Sherian A.  2010.  Mason Bees for the Backyard Gardener.   Inkwater Press

On-Line Guides

Sherian Wright’s website:  http://www.mountainbugs.com

Management of Hornfaced Bees for Orchard Pollination - A Practical Manual (Suzanne Batra, 1997) 

Orchard Mason Bees - WSU Extension King Co. Hort Fact Sheet #83 (PDF) 

How to Raise and Manage Orchard Mason Bees for the Home Garden by Stephen Bambara and James R. Baker, North Carolina WSU

ATTRA Guide to Alternative Pollinators, (National Sustainable Agriculture Information Service) 

The Xerces Society:  http://www.xerces.org/