Anuar, Dr. Mohd Shahir bin, et al. “Incidence of Postoperative Urinary Retention Following Spinal Anaesthesia With Colloid Co-Loading”. International Journal of Innovative Research in Medical Science, vol. 2, no. 01, Jan. 2017, p. 475 to 480, doi:10.23958/ijirms/vol02-i01/07.