Cita APA (7a ed.)

Schnapp, J. T. Introduction to "Purgatorio": Jeffrey T. Schnapp. The Cambridge companion to Dante.(2007).

Cita Chicago Style (17a ed.)

Schnapp, Jeffrey T. "Introduction to "Purgatorio": Jeffrey T. Schnapp." The Cambridge Companion to Dante.(2007) .

Cita MLA (8a ed.)

Schnapp, Jeffrey T. "Introduction to "Purgatorio": Jeffrey T. Schnapp." The Cambridge Companion to Dante.(2007), .