Once again, the Herald's sources of information had proved utterly reliable.

But renewable sources of power have proved to be less than reliable in recent years.

He had to protect his business on that end, since the source had proven so short-sighted.

Current sources and sinks have proven to be very valuable in the study of brain function.

In the event, Meighen's unusual source of support did not prove to bring him to success: he lost the by-election.

This year was no exception, with one important difference: These well-placed sources for once proved their worth.

However, the source soon proved unsatisfactory, and unsuitable for domestic use.

So it should surprise nobody that Castaneda's sources proved elusive.

When the system started testing in 1972, however, an unexpected source of noise proved to render it unusable.

But the source proved to be fabricating a tale, the police said, without offering details.