One surprising source turns out to be a little-known group of 20th-century European intellectuals.

The money is arriving, some of it from surprising sources.

The surprising source of the outbreak was traced to a single Colorado farm.

And he proposed to derive this new value system from a surprising source - science itself.

The opposite extreme is represented by a more surprising source.

Even some architects look to surprising sources for ideas.

The suggestion that ultimately resolved the difficulty came from a rather surprising source.

Others come from a more surprising source: mental-health professionals themselves.

Answering questions is a surprising source of influence in a child's life.

But, he said, he faces resistance from a surprising source.