Karpf-Kerkmann. (1997). Photo Technik International. Verlag Photo Technik International.
Cita Chicago (17th ed.)Karpf-Kerkmann. Photo Technik International. München: Verlag Photo Technik International, 1997.
Cita MLA (8th ed.)Karpf-Kerkmann. Photo Technik International. Verlag Photo Technik International, 1997.
Atenció: Aquestes cites poden no estar 100% correctes.