Rujukan

1. Murugiah s/o Velayutham, Koa Thuan Keat. (2010).HBMT2103 Teaching Mathematics In Year Two. (6th ed).Selangor darul Ehsan : Meteor Doc. Sdn. Bhd.
2. http://www.youtube.com/watch?v=Wl6VDFaNn10&feature=related
3. http://www.youtube.com/watch?v=qYtNhNP69lk&feature=related