Nothing and no one leaped out at her as the obvious source.

The most obvious source of all information about medical tests is your doctor.

The bridges would be obvious sources of food for these creatures.

"I have overlooked the most obvious source of fuel here."

For many buildings under threat there may be no obvious immediate source of information.

There was no obvious source at the base of the wall or around the window.

But when he did, he went to the most obvious source.

There is no obvious source for the material within sensor range.

The first and most obvious source of them was young gentlemen.

Among the obvious sources, probably the best are other lawyers.