Robertson, E., & Guy, F. (2017). Arp: The poetry of forms / Eric Robertson, Frances Guy ; Kröller-Müller Museum. Kröller-Müller Museum.
Lua i Stíl Chicago (17ú heag.)Robertson, Eric, agus Frances Guy. Arp: The Poetry of Forms / Eric Robertson, Frances Guy ; Kröller-Müller Museum. Otterlo: Kröller-Müller Museum, 2017.
Lua MLA (8ú heag.)Robertson, Eric, agus Frances Guy. Arp: The Poetry of Forms / Eric Robertson, Frances Guy ; Kröller-Müller Museum. Kröller-Müller Museum, 2017.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.