Just when the next election will take place is a major source of contention.

They are also a source of contention for environmental activists.

A uniform, I don't have to tell you, is always a source of contention between us.

Her looks had always been a source of contention between them when she and Natalie were young.

This had been a source of contention for some time.

A more likely source of contention between them was artistic.

The river's water has been a source of contention for many years.

Especially when it became a source of contention in the negotiations.

We'll just have to take problems as they come, but one is sure to be a source of contention.

Why is pilot pay always such a source of contention?