Shum, K. Y. (2013). Safe systems of work. The Institution of Engineers, Malaysia.
استشهاد بنمط شيكاغوShum, Keng Yan. Safe Systems of Work. The Institution of Engineers, Malaysia, 2013.
MLA استشهادShum, Keng Yan. Safe Systems of Work. The Institution of Engineers, Malaysia, 2013.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.