APA

PETER V. J., . (2009). Seven secular challenges facing: 21st century catholics. New York: Paulist press.

Chicago

PETER Val J, . 2009. Seven secular challenges facing: 21st century catholics. New York: Paulist press.

Harvard

PETER V. J., . (2009). Seven secular challenges facing: 21st century catholics. New York: Paulist press.

MLA

PETER Val J, . Seven secular challenges facing: 21st century catholics. New York: Paulist press. 2009.