Baysal, T., R. Kutlu, T. Altinok, and Y. Durmaz. “Value Of Superficial Ultrasonography In Determination Of Intramuscular Injection Technique And Needle Size On Infant Vaccination”. Annals of Medical Research, vol. 9, no. 3, May 2021, pp. 0191-4, http://www.annalsmedres.org/index.php/aomr/article/view/2919.