Krupp, W., & Arp, H. (2000). Arp: Line and form / essay by Walburga Krupp.
Lua i Stíl Chicago (17ú heag.)Krupp, Walburga, agus Hans Arp. Arp: Line and Form / Essay by Walburga Krupp. New York NY, 2000.
Lua MLA (8ú heag.)Krupp, Walburga, agus Hans Arp. Arp: Line and Form / Essay by Walburga Krupp. 2000.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.