http://www.wasershop.ch/city-shops/waser-papyrus-basel

http://www.lachenmeierfarben.ch/

http://www.tschopp-creativcenter.ch/

http://www.jumbo.ch/de/standorte/aff_c/Affiliates/aff_a/detail/aff_n/jumbo-compact-basel.html

http://www.dictionaryofarthistorians.org/