Helmi Ali
(1), Mohammed Al-Harbi
(2), Sara Al-Dhaheri
(3), Daniel Wilson
(4)
(1)
Institut Teknologi dan Bisnis Haji Agus Salim Bukittinggi, Indonesia,
(2)
King Fahd University of Petroleum and Minerals, Saudi Arabia,
(3)
Zayed University, United Arab Emirates,
(4)
University of Edinburgh, United Kingdom