Senan, P., Loe, Y., Gurpreet, K., Hayati, A., Haliza, A., Novia, K., Odhayakumar, N., Fadzilah, K., Chong, C., Nirmal, S., Balachandran, S. and Devan, K. (2013) “Poliomyelitis vaccination status among children in the Federal Territory of Kuala Lumpur 2007”, Western Pacific Surveillance and Response, 2(3). doi: 10.5365/wpsar.2010.1.1.014.