APA

Gros J., McManus E. & Riggs A. (1998). Introduction to Ecumenism. New York: Paulist Press.

Chicago

Gros Jeffrey, McManus Eamon and Riggs Ann. 1998. Introduction to Ecumenism. New York: Paulist Press.

Harvard

Gros J., McManus E. and Riggs A. (1998). Introduction to Ecumenism. New York: Paulist Press.

MLA

Gros Jeffrey, McManus Eamon and Riggs Ann. Introduction to Ecumenism. New York: Paulist Press. 1998.