Groot, P. (1988). Sigmar Polke: Impervious to facile interpretations, Polke wants to reinstate the mystery of the painting. Flash Art.
Chicago-Zitierstil (17. Ausg.)Groot, Paul. "Sigmar Polke: Impervious to Facile Interpretations, Polke Wants to Reinstate the Mystery of the Painting." Flash Art 1988.
MLA-Zitierstil (8. Ausg.)Groot, Paul. "Sigmar Polke: Impervious to Facile Interpretations, Polke Wants to Reinstate the Mystery of the Painting." Flash Art, 1988.
警告：這些引文格式不一定是100％准確.