Edited by Nicholas Lossky and others.
2nd edition. Geneva: WCC Publications, 2003.
Articles on the ecumenical aspects of particular theological topics (e.g. grace), as well as articles on important persons and groups in ecumenical dialogue.
The online version is available on the Internet Archive, a trusted source, but one for which it is necessary to create a free account and login.
For print version locations, see the
UofT Library Catalogue.