Mackay, John Alexander, 1889- Ecumenics : the science of the church universal / [by] John A. Mackay. - Englewood Cliffs, N. J. : Prentice-Hall, [1964] - ix., 204 p. ; 24 cm. Bibliography: p. 267-288. LCCN: 64022800 Subjects--Topical Terms: Church. LC Class. No.: BV600.2 / .M33 Dewey Class. No.: 270.82 Mac 1964