Question

To what Shibboleth Federation does RefWorks belong?

Answer

RefWorks is a member of InCommon and OpenAthens.
Our EntityID is https://shibboleth.refworks.proquest.com/shibboleth/sp

If you use eduPersonPrincipalName, please release "eppn".

If you use eduPersonTargetedID, please release "persistent-id" or "oid-targeted-id". Other attributes would be needed if you use scope (sub institution level access) or affiliation (user roles).

Our metadata can be downloaded from here: https://shibboleth.refworks.proquest.com/Shibboleth.sso/Metadata 
When you open the file you will see an entityId=https://shibboleth.refworks.proquest.com/shibboleth/sp

Related articles:
Shibboleth/OpenAthens and RefWorks
How do I relink Single Sign On (SSO), Institutional Login, account with my RefWorks account?