found: Morellet, F. Werke 1976-1983, c1983: t.p. (Josef-Albers-Museum Bottrop) p. 6, etc. (Josef-Albers-Museum in Bottrop; Bottrop, Josef-Albers-Museum)
found: Vasarely, c1997: t.p. (Quadrat, Bottrop Josef Albers Museum)
found: Museumszentrum Quadrat WWW Home page, Dec. 18, 1998 (Quadrat Bottrop is a museum complex comprises three museums: Josef-Albers-Museum, Moderne Galerie; and the Museum für Ur- und Ortsgeschichte)
found: Zeichnungen von Josef Albers, 1988: t.p. (Josef Albers Museum Bottrop)
found: Erich Buchholz, 1998: verso t.p. (Quadrat Bottrop Josef Albers Museum, Bottrop)
found: Ad Reinhardt : letzte Bilder, c2011: colophon (Josef Albers Museum Quadrat Bottrop)
notfound: Handb. d. Mus., 1981;Int. dir. of arts, 83/84.
Josef-Albers-Museum
