https://www.numl.edu.pk/journals/subjects/1561352025NUML%20JCI%20ISSN%2022225706%20Vol%209(ll),%20December,%202011.pdfhttps://www.numl.edu.pk/journals/subjects/1561352074NUML%20JCI%20ISSN%2022225706%20Vol%209(l),%20June,%202011.pdf