Derivatives are also common but have no formal indigenous sources.

Often the best correlation can be made when both European and indigenous sources give a specific date.

But skeptics wonder if these supposed cars of the future will be powered mainly by an old-fashioned indigenous source of energy: politics.

The Jamestown Foundation most often acquires its information through indigenous primary sources.

Utilizing indigenous and primary sources, Jamestown's material is delivered without political bias, filter or agenda.

But in countries further west a stronger inspiration comes from indigenous sources.

We need to develop indigenous sources of renewable energy like wind and solar.

Most of the insurgency, he added, was "self-generating" and drawing support from indigenous sources.

India's policy of weaponisation via indigenous sources and self-sufficiency was thus cemented.

In this context, I also think we should reopen the debate on coal, because it is our only indigenous source of fossil energy.