I. D. Khattak, T. M. Khan, P. Khan, S. M. A. Shah, S. T. Khattak, and A. Ali, “FREQUENCY OF ABO AND RHESUS BLOOD GROUPS IN DISTRICT SWAT, PAKISTAN”, J Ayub Med Coll Abbottabad, vol. 20, no. 4, pp. 127–129, Dec. 2008.