1. Abraham, Sam. 2018. “Made in Germany: DFB, decided to revamp their game through the youth system - The Economic Times.” Economic Times website, April 23. https://economictimes.indiatimes.com/news/sports/made-in-germany-dfb-decided-to-revamp-their-game-through-the-youth-system/articleshow/59730031.cms?from=mdr.
2. Abseits. n.d. “League structure in Germany - Abseits Guide to German Soccer.” Abseits. http://www.abseits-soccer.com/germany.html.
3. Alagic, Amir. 2017. “German football is reaping the rewards of their football strategy -Amir Alagic’s blog.” In.: Xtratime, July 5.
4. Albright, Madeleine. 2014. “(DOC) HRM Models | Madeleine Albright - Academia.edu.” Academia, Janaury 12. https://www.academia.edu/1,06,20,281/HRM_Models.
5. The relative age effect and success in German elite U-17 soccer teams