At the time, the region was the sole source of cloves.
He was virtually the sole source of information about Arizona to the outside world.
We can't expect the North to be our sole source of supplies.
Jordan's death would be the sole driving source behind everything they did from now on.
More than half the Iraqi people depend on this program as their sole source of food.
"The answer is not to use test scores as the sole source of information about a student's performance," he said.
But schools have never been the sole - or even best - source of our children's education, especially poor inner-city students.
I just don't like Mann as the sole source of information.
As the sole source of the stuff, we could pretty much control everything.
But for now, the research market is the company's sole source of revenue.