Nadeem Nusrat, Asma Shaikh, Muhammed Akbar Agha, Saddam Hussain Kalwar, Saima Minhas, Khaleeque-u-Nisa, Zeeshan-ul-Qadar, Rafique Khannani 2014. Identification of Group "A & AB" Major Sub-Groups in a Mixed Pakistani Population of Karachi . Journal of Peoples University of Medical & Health Sciences Nawabshah. (JPUMHS). 4, 1 (Mar. 2014), 15–19.