Type the name of the editor, since there is no listed author. Then, type the year in which the book was published.
Add the title in italics. Follow up with the place where the book was published and the publishing company.
Proofread your work. For this example -- the 12th edition of the handbook, published in 2010 -- it should look like this:
Laskey, E. (Ed.). (2010). The Boy Scout Handbook (title in italics). Irving, TX: Boy Scouts of America.
In your reference list, you would indent the second line 1/2 inch.