APA

O B. S. M. C., . (1939). The antecedents of being. Washington: Catholic University of America.

Chicago

O Brien Sister Mary Concilia, . 1939. The antecedents of being. Washington: Catholic University of America.

Harvard

O B. S. M. C., . (1939). The antecedents of being. Washington: Catholic University of America.

MLA

O Brien Sister Mary Concilia, . The antecedents of being. Washington: Catholic University of America. 1939.