This work would later become the main source of material for his first published works.

Diaries have been a rich source of material for me.

His triangle is used with one market and two sources of material.

Today, they are the largest single source of historical material about visual art in the country.

The mass media provide a further source of material for research.

The second source of photographic material is your home network.

But while artists memories may serve as one source of material, their daily lives provide another.

In Britain, the source of most material, the market is particularly active.

They were a good source of material for his sermons.

He also likes business travel because it is a rich source of material.