Gaya APA

Decasa, G, C. (1999). The Qur'anic concept of Umma and its function in Philippine Muslim society. . Roma: Roma Pontificia Università Gregoriana.

Gaya MLA

Decasa, George, C.. "The Qur'anic concept of Umma and its function in Philippine Muslim society. ". Roma: Roma Pontificia Università Gregoriana, 1999. Buku.