{{cite journal | last1=Khan | first1=M. A. | author2=F. Manzoor | author3=M. Ali | author4=Z. H. Bhatti | author5=M. Akhtar | year=2011 | title=A NEW COLLECTION OF HIPPARIONINE FROM THE TYPE LOCALITY OF THE DHOK PATHAN FORMATION OF THE MIDDLE SIWALIKS | journal=Journal of Animal and Plant Sciences | volume=21 | issue=1 | pages=83-89 | issn=1018-7081 | eissn=2309-8694 | publisher=Pakistan Agricultural Scientists Forum | url=https://thejaps.org.pk/AbstractView.aspx?mid=2011-JAPS-101}}