Nik Rowina Nik Mohammed. (2012). Effect of ethyl chloride vapocoolant spray on pain during intravenous cannulation in adult patients: Randomized double blind placebo controlled trial. Faculty of Medicine, Universiti Kebangsaan Malaysia.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Nik Rowina Nik Mohammed. Effect of Ethyl Chloride Vapocoolant Spray on Pain During Intravenous Cannulation in Adult Patients: Randomized Double Blind Placebo Controlled Trial. Kuala Lumpur: Faculty of Medicine, Universiti Kebangsaan Malaysia, 2012.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Nik Rowina Nik Mohammed. Effect of Ethyl Chloride Vapocoolant Spray on Pain During Intravenous Cannulation in Adult Patients: Randomized Double Blind Placebo Controlled Trial. Faculty of Medicine, Universiti Kebangsaan Malaysia, 2012.