Cita APA (7a ed.)

Richter, G. M. A. (1956). Catalogue of engraved gems greek, Etruscan and Roman. L'Erma di Bretschneider.

Cita Chicago Style (17a ed.)

Richter, Gisela M. A. Catalogue of Engraved Gems Greek, Etruscan and Roman. Roma: L'Erma di Bretschneider, 1956.

Cita MLA (9a ed.)

Richter, Gisela M. A. Catalogue of Engraved Gems Greek, Etruscan and Roman. L'Erma di Bretschneider, 1956.