1. https://www.efcni.org/health-topics/going-home/safe-sleep/
2. https://www.kindergesundheit-info.de/fileadmin/user_upload/kindergesundheit-info.de/Download/Schlafen/Schlafempfehlungen-Baby_BZgA_kindergesundheit-info.pdf
3. https://www.dgkj.de/eltern/dgkj-elterninformationen/elterninfo-sicherer-schlaf
4. https://www.cdc.gov/reproductivehealth/features/baby-safe-sleep/index.html
5. https://www.sahealth.sa.gov.au/wps/wcm/connect/a965e20048a319a3bafcfe7675638bd8/4858+Safe+Sleeping+Standards.V9.2.PROOF.PDF?MOD=AJPERES&CACHEID=ROOTWORKSPACE-a965e20048a319a3bafcfe7675638bd8-n5ivSSm
6. https://www.lullabytrust.org.uk/safer-sleep-advice/
8. http://staff.pubhealth.ku.dk/~tag/Teaching/share/material/carpenter2004.pdf