Hi:
Go to Hobby Lobby or Joanne Fabrics or any fabric store an go to the Pattern section and There in the Simplicity and Butterick and other fabric books they have apron sewing patterns in them that you can buy:
http://www.simplicity.com/index.cfm?cat=3&type=0&sec=27&startrow=1
http://www.mccalls.com - type apron in the seach box.
http://www.butterick.com- type apron in the seach box.
Go to http://www.ebay.com - Type apron patterns in the search box and you can find all kind of apron sewing pattern there
Here are some websites that might interest you:
http://home.mindspring.com/~angeliakay/id2.html
http://www.straw.com/cpy/patterns2/cot_chen_apron.html
http://www.talewins.com/crafts/aprons.htm
http://www.thefamilyhomestead.com/sewingcrafts.htm
http://tipnut.com/free-dish-soap-apron-patterns/
http://www.expertvillage.com/interviews/apron-making.htm
http://etherwork.net/ejmtph/sew/apron.html
http://www.dltk-kids.com/crafts/insects/mladybugapron.htm
http://www.craftster.org/forum/index.php?topic=177941.new
http://www.zianet.com/joblack/FCS/Apron/001.html
http://www.craftygal.com/archives/402/table402.htm
http://morganmoore.typepad.com/one_more_moore/2007/02/valentine_tree__1.html
http://crafts.kaboose.com/bbq.html
The following books might interest you:
The Apron Book : Making, Wearing, and Sharing a Bit of Cloth and Comfort
by EllynAnne Geisel, Ellynanne Geisel- a most execellent book on the subject
Aprons of the Mid-Twentieth Century : To Serve and Protect
by Judy Florence
Gingham Aprons of the '40s and 50s : A Checkered Past
by Judy Florence
Apron Makin: A Pattern and Idea Book
by Suzy Lawson, Beverly E. Soasey
Apron Makin: A Pattern and Idea Book
by Suzy Lawson, Beverly E. Soasey
Aprons W/Charm
by Joyce Cheney
Aprons and Bibs -- over 30 Vintage Sewn and Crocheted Ideas
by Bramcost Publications
Hope this helps.