{{cite journal | last1=Alsobayel | first1=A. A. | author2=M.A. Albadry | year=2012 | title=EFFECT OF AGE AND SEX RATIO ON FERTILITY AND HATCHABILITY OF BALADI AND LEGHORN LAYING HENS | journal=Journal of Animal and Plant Sciences | volume=22 | issue=1 | pages=15-19 | issn=1018-7081 | eissn=2309-8694 | publisher=Pakistan Agricultural Scientists Forum | url=https://thejaps.org.pk/AbstractView.aspx?mid=2012-JAPS-121}}