Awais Ahmed, Muhammad Nasir Malik, Obaid Anwar Awan, Asif Muzaffar The Lahore Journal of Business, Volume 5, Issue 2, Oct - Mar 2017, pages 23-44, https://doi.org/10.35536/ljb.2017.v5.i2.a2
Ishfaq Ahmed, Muhammad Khalid Khan and Ghulam Ali Bhatti The Lahore Journal of Business, Volume 5, Issue 2, Oct - Mar 2017, pages 67-80, https://doi.org/10.35536/ljb.2017.v5.i2.a4