Riaz, A., A. R. Ali Shah, and S. A. Ullah Jafri. “Comparison of Pediatric Caudal Block With Ultrasound Guidance or Landmark Technique”. Anaesthesia, Pain & Intensive Care, Vol. 23, no. 1, July 2019, https://mail.apicareonline.com/index.php/APIC/article/view/993.