United States income tax law comes from a number of sources.

We are still working with a limited number of sources, though.

Let me just tell you what a number of human sources have told us.

Far more important than the number of sources is their identity.

The park grew through the 1940s and 1950s with money from a number of sources.

Yet there are a number of sources for 19th-century items.

You can find what I'm about to say in any number of sources.

The chemicals could have come from any number of other sources.

Help came from a number of sources, including his own deep faith, but there were individuals too.

The system has been reported in a number of public sources.