{{cite journal | last1=Jankowiak | first1=H. | author2=W. KapelaDski | author3=M. Bocian | year=2019 | title=INFLUENCE OF LITTER SIZE INTO WHICH GILTS ARE BORN ON THE DEVELOPMENT OF THEIR REPRODUCTIVE SYSTEMS | journal=Journal of Animal and Plant Sciences | volume=29 | issue=2 | pages=359-364 | issn=1018-7081 | eissn=2309-8694 | publisher=Pakistan Agricultural Scientists Forum | url=https://thejaps.org.pk/AbstractView.aspx?mid=2019-JAPS-202}}