-, M., H. A. E.W., and S. W. Santoso. “The Influence of Customers Communication Behaviour in the Implementation of 21cineplex Viral Marketing Using the Social Networking Site Facebook”. CommIT (Communication and Information Technology) Journal, vol. 9, no. 1, May 2015, pp. 11-18, doi:10.21512/commit.v9i1.1643.