{{cite journal | last1=Afzal | first1=H. | author2=M. Ali | author3=A. Sajjad | author4=F. Nawaz | author5=S. Saeed | year=2023 | title=HEAVY METAL CONCENTRATIONS OF COPPER AND NICKEL IN PERI-URBAN VEGETABLE AGRO-ECOSYSTEM OF MULTAN, PAKISTAN | journal=Journal of Animal and Plant Sciences | volume=33 | issue=2 | pages=296-302 | doi=10.36899/JAPS.2023.2.0621 | issn=1018-7081 | eissn=2309-8694 | publisher=Pakistan Agricultural Scientists Forum | url=https://thejaps.org.pk/AbstractView.aspx?mid=AG-21-0206}}