Simmons Christopher. (1942). Letterhead & Logo Design 9. Oxford.
Cita Chicago (17th ed.)Simmons Christopher. Letterhead & Logo Design 9. USA: Oxford, 1942.
Cita MLA (9th ed.)Simmons Christopher. Letterhead & Logo Design 9. Oxford, 1942.
Atenció: Aquestes cites poden no estar 100% correctes.