Jaffe, J., & Albarda, M. (2014). Z.E.R.O.: Zero paid media as the new marketing model. John Wiley and Sons.
Lua i Stíl Chicago (17ú heag.)Jaffe, Joseph, agus Maarten Albarda. Z.E.R.O.: Zero Paid Media as the New Marketing Model. Hoboken, New Jersey: John Wiley and Sons, 2014.
Lua MLA (9ú heag.)Jaffe, Joseph, agus Maarten Albarda. Z.E.R.O.: Zero Paid Media as the New Marketing Model. John Wiley and Sons, 2014.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.