Kwan, Chin Swee, and Filzah Md Isa. 2016. “The Relationship Between Leadership, Span of Control, Perception of Islamic Products and Services, Perception of Internal Service Quality and the Agents’ Job Satisfaction: A Case of Unit Trust Agents in Johor Bahru”. International Review of Management and Marketing 6 (8S):149-52. https://econjournals.com./index.php/irmm/article/view/3925.