L.G.
Here's an excellent book:
"Good Night Sleep Tight, The Sleep Lady's Gentle Guide to Helping Your Child Go to Sleep, Stay Asleep, and Wake Up Happy"
Author: Kim West with Joanne Kenen.
It addresses sleep issues by the age of the child, and actually kind of offers a compromise. A way to wean him off of your presence in the room as a sleep aid, but with no tears on his OR your part.
Worked for me with my son!