Cita APA (7a ed.)

Richter, G. M. A. (1956). Catalogue of Engraved Gems: Greek, etruscan and roman. Metropolitan Museum of Art by "L'erma" di Bretschneider.

Cita Chicago Style (17a ed.)

Richter, Gisela M. A. Catalogue of Engraved Gems: Greek, Etruscan and Roman. Roma: Metropolitan Museum of Art by "L'erma" di Bretschneider, 1956.

Cita MLA (9a ed.)

Richter, Gisela M. A. Catalogue of Engraved Gems: Greek, Etruscan and Roman. Metropolitan Museum of Art by "L'erma" di Bretschneider, 1956.