As nearly as I could make out, though, the sound didn't come from any particular source.

I shall not attempt to distinguish the particular sources of individual ideas.

But each network has its own particular source of motivation to excel during a war, should there be one.

The influence is of a particular kind, from a particular source.

It was time to start looking for help, and this particular source couldn't be ignored, however much she might wish to.

One particular source, found in great supply, is ocean water.

Surely there must be particular sources you used in studying the 20th Century.

This is a feature of 'the They' as it functions in society, an authority that has no particular source.

Guns, the handguns, will be a particular source of our efforts.

There's not one particular source from where I get my inspiration.