Here is a list of websites that were referenced for this curriculum unit:
http://www.vertabelo.com/blog/technical-articles/crow-s-foot-notationarrow-up-right
https://www.youtube.com/watch?v=TpKcAmaaBtsarrow-up-right
https://www.visual-paradigm.com/guide/uml-unified-modeling-language/uml-aggregation-vs-compositionarrow-up-right
https://www.lucidchart.com/pages/ER-diagram-symbols-and-meaningarrow-up-right
https://msdn.microsoft.com/en-us/library/dd409416.aspxarrow-up-right
https://www.codeproject.com/Articles/878359/Data-modelling-using-ERD-with-Crow-Foot-Notationarrow-up-right
https://softwareengineering.stackexchange.com/questions/315565/are-crow-feet-notation-and-uml-notation-samearrow-up-right
https://www.ntu.edu.sg/home/ehchua/programming/sql/SampleDatabases.htmlarrow-up-right
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