Cita APA (7a ed.)

Martyn, J. R. C. (2012). Pope Gregory's letter-bearers: A study of the men and women who carried letters for Pope Gregory the Great. Cambridge Scholars Pub.

Cita Chicago Style (17a ed.)

Martyn, John R. C. Pope Gregory's Letter-bearers: A Study of the Men and Women Who Carried Letters for Pope Gregory the Great. Newcastle upon Tyne: Cambridge Scholars Pub, 2012.

Cita MLA (9a ed.)

Martyn, John R. C. Pope Gregory's Letter-bearers: A Study of the Men and Women Who Carried Letters for Pope Gregory the Great. Cambridge Scholars Pub, 2012.