Cita APA (7th ed.)

Gray, J. E. (1875). The illustrated catalogue of postage stamps (6a. ed.). E. Marlborough & Co.

Cita Chicago (17th ed.)

Gray, John Edward. The Illustrated Catalogue of Postage Stamps. 6a. ed. Londres: E. Marlborough & Co, 1875.

Cita MLA (9th ed.)

Gray, John Edward. The Illustrated Catalogue of Postage Stamps. 6a. ed. E. Marlborough & Co, 1875.