References
- Subramaniam , KB . 1994 . A generalization of Euler's reproductive properties of triangular numbers . Int. J. Math. Educ. Sci. Technol. , 25 : 767 – 769 .
- Online Encyclopedia Wikipedia , http://www.en.wikipedia.org/triangular number
- Trotter , T . 1973 . Some identities for triangular numbers . J. Recreational Math. , 6 : 128 – 135 .