The free trade agreement is a potent source of anxiety for workers rattled by recession.

In the post-classical arts, it became a potent source of inspiration.

The part played by words in all this is complicated, and a potent source of confusions; I shall return to it later.

He needed access to more data, to potent sources.

The country station was literally a lifeline, a vital and potent source of contact with the outside world.

Books here are the real, potent sources of magic.

They made journalism, fiction and poetry a potent source of political dissent.

Nature is the most potent source of healing for the mind body-spirit.

They are also potent sources of anti-oxidants, which have been linked to protection against cancer and heart disease.

The financial transaction tax would provide a potent new source of development funding.