1. USCIRF: U.S. Commission on International Religious Freedom (Annual Report). USCIRF, New York (2017)
2. Riyanto, A.D.: Pemanfaatan Google Trends Dalam Penentuan Kata Kunci Sebuah Produk untuk Meningkatkan Daya Saing Pelaku Bisnis di Dunia Internet. Seminar Nasional Informatika 1(1), 52–59 (2014)
3. Sullivan, D.: Google now handles at least 2 trillion searches per year, 24 May 2016.
https://searchengineland.com/google-now-handles-2-999-trillion-searches-per-year-250247
. Accessed 10 Dec 2018
4. Choi, H., Varian, H.: Predicting the present with Google trends. Econ. Rec. 88(S1), 2–18 (2012)
5. Lee, M.H., Hamzah, N.A.: Calendar variation model based on ARIMAX for forecasting sales data with Ramadhan effect. In: Proceedings of the Regional Conference on Statistical Sciences 2010 (RCSS 2010), Kelantan (2010)