On loan

An ex-L.S.W.R. 0-6-0 goods engine, No. 0395, and a "Terrier" tank-engine, No. 2678, are now on loan.

Shortly thereafter Sugarman learned that the technology behind the pricey sunglasses wasn't on loan from NASA.

As you generate your list of references check whether your library holds the books, and if so whether they are on loan.

Bowman only hinted it was “on loan” from the Chatham Dockyard, so I didn't ask more.

She worked on loan from another agency.