McKinnon, J. W. (1987). The fourth-century origin of the Gradual.
Cita Chicago Style (17a ed.)McKinnon, James W. The Fourth-century Origin of the Gradual. 1987.
Cita MLA (9a ed.)McKinnon, James W. The Fourth-century Origin of the Gradual. 1987.
Precaución: Estas citas no son 100% exactas.
