Ismail M.T.M. and  Jaffar Ali. “Effects of friends feminine wipes on sperm viability in-vitro”. Malaysian Journal of Reproductive Health, vol. 8, no. 2, 1990, pp. 62-65.

K. Nigam, Prabhat, et al. “Effect of centchroman on lipid metabolism in genital organs of female rhesus monkeys (macaca mulatta)”. Malaysian Journal of Reproductive Health, vol. 5, no.1, 1987, pp. 37-45.

Verma G.N. & Kartar Srivastava. "Effect of norgestrel and testosterone on male rats". Malaysia Journal of Reproductive Health, vol.5, no.1, 1987, pp. 31-36.

Ethnicity, attitude and fertility survey. National Family Planning Board, Malaysia, 1980.