Ismail, S. ., and S. S. M. . Mokhtar. “Linking Attitude to Actual Purchase of Herbal Product in Malaysia: The Moderating Role of Perceived Risk”. Journal of Asian Business Strategy, vol. 6, no. 2, May 2016, pp. 22-30, doi:10.18488/journal.1006/2016.6.2/1006.2.22.30.