{{cite journal | last1=Yildirim | first1=E. | author2=M. Turan | year=2013 | title=GROWTH, YIELD AND MINERAL CONTENT OF BROCCOLI INTERCROPPED WITH LETTUCE | journal=Journal of Animal and Plant Sciences | volume=23 | issue=3 | pages=919-922 | issn=1018-7081 | eissn=2309-8694 | publisher=Pakistan Agricultural Scientists Forum | url=https://thejaps.org.pk/AbstractView.aspx?mid=2013-JAPS-339}}