Orthodox handbook on ecumenism : resources for theological education : "That they all may be one" (John 17:21) / editors Pantelis Kalaitzidis, Thomas FitzGerald, Cyril Hovorun, Aikaterini Pekridou, Nikolaos Asproulis, Guy Liagre, Dietrich Werner.    Volos : Volos Academy Publications (in cooperation with WCC Publications, Geneva, and Regnum Books International, Oxford), 2014 . xxxvi, 962 stran