Panhans-Bühler, U., Schleis, J., & Seyfahrt, L. (2013). Drawing a Universe: William Engelen, Bettina Krieg, Jenny Mcihel, Anke Röhrscheid, Nora Schattauer, David Thorpe, Jorinde Voigt / [Kurator: Ludwig Seyfarth. Autoren: Ursula Panhans-Bühler Red.: Julia Schleis ]. Kerber [u.a.].
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিPanhans-Bühler, Ursula, Julia Schleis, এবং Ludwig Seyfahrt. Drawing a Universe: William Engelen, Bettina Krieg, Jenny Mcihel, Anke Röhrscheid, Nora Schattauer, David Thorpe, Jorinde Voigt / [Kurator: Ludwig Seyfarth. Autoren: Ursula Panhans-Bühler Red.: Julia Schleis ]. Bielefeld [u.a.]: Kerber [u.a.], 2013.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিPanhans-Bühler, Ursula, et al. Drawing a Universe: William Engelen, Bettina Krieg, Jenny Mcihel, Anke Röhrscheid, Nora Schattauer, David Thorpe, Jorinde Voigt / [Kurator: Ludwig Seyfarth. Autoren: Ursula Panhans-Bühler Red.: Julia Schleis ]. Kerber [u.a.], 2013.