AGOF
www.agof.de

ARD/ZDF-Online-Studie
www.ard-zdf-onlinestudie.de

BITKOM
www.bitkom.org

BVDW
www.bvdw.org

eiaa - European Interactive Advertising Association
www.eiaa.net

Millward Brown
www.millwardbrown.com

Nielsen Media Research
www.nielsenmedia.com