{{cite journal | last1=Al-Hassan | first1=Mohamed J. | year=2018 | title=SEASONAL VARIATIONS IN PROGESTERONE SECRETIONS IN PREGNANT AND NON-PREGNANT AARDI GOATS IN THE SEMI-ARID REGION OF SAUDI ARABIA | journal=Journal of Animal and Plant Sciences | volume=28 | issue=4 | pages=1182-1185 | issn=1018-7081 | eissn=2309-8694 | publisher=Pakistan Agricultural Scientists Forum | url=https://thejaps.org.pk/AbstractView.aspx?mid=2018-JAPS-429}}