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3. Facebook doubleclick for publishers (dfp) optimization website. https://www.facebook.com/business/a/online-sales/ad-optimization-measurement (2014). Facebook doubleclick for publishers (dfp) optimization website. https://www.facebook.com/business/a/online-sales/ad-optimization-measurement (2014).
4. Google doubleclick bid manager website. http://www.thinkwithgoogle.com/products/doubleclick-bid-manager.html (2014). Google doubleclick bid manager website. http://www.thinkwithgoogle.com/products/doubleclick-bid-manager.html (2014).
5. Google doubleclick for publishers (dfp) optimization website. http://static.googleusercontent.com/media/www.google.com/en/us/doubleclick/pdfs/optimization.pdf (2014). Google doubleclick for publishers (dfp) optimization website. http://static.googleusercontent.com/media/www.google.com/en/us/doubleclick/pdfs/optimization.pdf (2014).