Ahmad Syaifulizan Bin Zulkeefly. (2011). Maritime industry: The comparative analysis of global maritime ventures berhad and selected companies in the main board of Bursa Malaysia (2005-2009). Graduate School of Management, International Islamic University Malaysia.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Ahmad Syaifulizan Bin Zulkeefly. Maritime Industry: The Comparative Analysis of Global Maritime Ventures Berhad and Selected Companies in the Main Board of Bursa Malaysia (2005-2009). Kuala Lumpur: Graduate School of Management, International Islamic University Malaysia, 2011.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Ahmad Syaifulizan Bin Zulkeefly. Maritime Industry: The Comparative Analysis of Global Maritime Ventures Berhad and Selected Companies in the Main Board of Bursa Malaysia (2005-2009). Graduate School of Management, International Islamic University Malaysia, 2011.