Robertson, E., & Guy, F. (2017). Arp: The poetry of forms / Eric Robertson, Frances Guy ; Kröller-Müller Museum. Kröller-Müller Museum.
Čikaški stil citiranja (17. izdanje)Robertson, Eric, i Frances Guy. Arp: The Poetry of Forms / Eric Robertson, Frances Guy ; Kröller-Müller Museum. Otterlo: Kröller-Müller Museum, 2017.
MLA način citiranja (8. izdanje)Robertson, Eric, i Frances Guy. Arp: The Poetry of Forms / Eric Robertson, Frances Guy ; Kröller-Müller Museum. Kröller-Müller Museum, 2017.
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