They also could not find any form of power source.

I couldn't even guess where the power source might be.

These had been their source of power during all the past two years.

We'll cut him off from the source of his power.

He wants to put down on top of the power source and take it over.

The power source was right where Will said it would be.

We'll know a lot more once we reach the power source.

The sources and changes of power were up to the states.

The river has provided an important source of power in the past.

Don't you know that the source of a man's power is in his hair?