Wulffen, T., Gonzalez-Foerster, D., & Leen, F. (1987). Situation: Von Thomas Wulffen, Dominique Gonzalez-Foerster, Frederick Leen. Kunstforum.
Cita Chicago (17th ed.)Wulffen, Thomas, Dominique Gonzalez-Foerster, i Frederick Leen. "Situation: Von Thomas Wulffen, Dominique Gonzalez-Foerster, Frederick Leen." Kunstforum 1987.
Cita MLA (8th ed.)Wulffen, Thomas, et al. "Situation: Von Thomas Wulffen, Dominique Gonzalez-Foerster, Frederick Leen." Kunstforum, 1987.
Atenció: Aquestes cites poden no estar 100% correctes.