1. Crystal, David 2003. (2 nd Ed) English as a global language Cambridge, New York, Melbourne, Madrid, Cape Town, Singapore
2. Harmanto, bambang.2015. Designing Exciting Learning for Digital Generation. Accessed from http://eprints.umpo.ac.id/1755/2/10 accessed on 15 June 2017
3. Kasbolah, Kasiani. 2007. Teaching English in Primary Schools: policy, implementation, and reality. The paper was presented in the inauguration of the professor at the State University of Malang.
4. Moon, Jayne. (2000). Children Learning English. Oxford: Macmillan Publishers Limited. Nissani, Helen. 1993. Early Childhood Programs for Language Minority Students
5. Rahmat, Aceng. 2010. Implementation of Foreign Language Curriculum in DKI Jakarta Kindergarten (tk). Journal of Linguistic Studies and June 2010, vol. 22. no.1,