APA (7th ed.) Citation

Krekel, C., & Polborn, K. Lime Blue - A Mediaeval Pigment for Wall Paintings?

Chicago Style (17th ed.) Citation

Krekel, Christoph, and Kurt Polborn. Lime Blue - A Mediaeval Pigment for Wall Paintings?

MLA (9th ed.) Citation

Krekel, Christoph, and Kurt Polborn. Lime Blue - A Mediaeval Pigment for Wall Paintings?

Warning: These citations may not always be 100% accurate.