Cita APA (7th ed.)

Körting, K., & Kratschmer, E. (1994). Stones of Europe.

Cita Chicago (17th ed.)

Körting, Kristian, i Edwin Kratschmer. Stones of Europe. Saalfeld, 1994.

Cita MLA (8th ed.)

Körting, Kristian, i Edwin Kratschmer. Stones of Europe. 1994.