Gaya APA

Derr, T, S. (1983). Barriers to ecumenism, the Holy See and the World Council of Churches on social questions. . New York: Orbis.

Gaya MLA

Derr, Thomas, Sieger.. "Barriers to ecumenism, the Holy See and the World Council of Churches on social questions. ". New York: Orbis, 1983. Buku.