1. Amanto and La Zakaria, Jurnal Sains MIPA, Special Editionyear I4, 23–32 (2008).
2. Josh Altic, Presentationfile, Double Pendulum (15 May 2008).
3. Joe Chen, “Summer Research Project Department of Mathematics and Statistics College Engineering University of Canterbury,” in Chaos from Simplicity: An Introduction to The Double Pendulum-2008. (Department of Mathematics and Statistics College Engineering University of Canterbury, Christchurch, New Zeland, 2008), pp. 1–22.
4. Ultimate energy of a double pendulum undergoing quasiperiodic oscillations
5. Estimating the chaos boundaries of a double pendulum