Sentence examples for their source is from inspiring English sources

But in many cases their source is unknown.

Yes, and their source is the Swiss System of pairings.

The words are erotic, but their source is religious; they are adapted from "Song of Songs".

Basic facts about North Korea are unknown or their source is deeply dubious.

For dogs, whose noses are extraordinarily sensitive, tracking these aromas to their source is relatively straightforward.

These spikes are very well observed, but their source is not yet understood.

Their source was Time magazine.

Their source was Friedrich Hayek, in fact an Austrian.

The journalists said their source was the royal family's lawyer, Thierry Lacoste.

The two had pledged not to expose him until their source was dead.

Their source was a tape from the Paris Opera Ballet, which suggests this version was presumably by a ballet master there, Yevgeny Polyakov.