Focillon, H., Wittenborn, G., & Van de Velde, R. (2007). Artists' Handbook: George Wittenborn's Guestbook, with 21st Century / Additions Initiated by Ronny Van de Velde. Ludion.
Chicagoスタイル(17版)引用形式Focillon, Henri, George Wittenborn, , Ronny Van de Velde. Artists' Handbook: George Wittenborn's Guestbook, with 21st Century / Additions Initiated by Ronny Van De Velde. Ghent: Ludion, 2007.
MLA(8版)引用形式Focillon, Henri, et al. Artists' Handbook: George Wittenborn's Guestbook, with 21st Century / Additions Initiated by Ronny Van De Velde. Ludion, 2007.
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