1. 1. WHO, news room [Internet]. [cited 2020 Dec 17]. Available from: https://www.who.int/news-room/q-a-detail/vaccines-and-immunization-what-is-vaccination?adgroupsurvey=%7Badgroupsurvey%7D&gclid=EAIaIQobChMI3_Sa0JDV7QIVzeh3Ch2w9QEVEAAYASAAEgJEDPD_BwE
2. 2. UNİCEF, Türkiye, Bağışıklama [Internet]. Available from: https://www.unicef.org/turkey/bağışıklama
3. 3. Akdeniz M, Kavukcu E. Aşılama ve Aşıların Tarihçesi. Klin Tıp Aile Hekim [Internet]. 2016;8(2):11–28. Available from: https://dergipark.org.tr/tr/pub/ktah/issue/45376/487032
4. 4. WHO, health topic [Internet]. [cited 2020 Dec 12]. Available from: https://www.who.int/health-topics/vaccines-and-immunization?adgroupsurvey=%7Badgroupsurvey%7D&gclid=EAIaIQobChMItICl0ojI7QIVl9wYCh1jrwjCEAAYASABEgI4CfD_BwE#tab=tab_1
5. 5. Shukla V V., Shah RC. Vaccinations in Primary Care. Indian J Pediatr [Internet]. 2018;85(12):1118–27. Available from: http://dx.doi.org/10.1007/s12098-017-2555-2