Apa format, references please provide all details of the question. No plagiarism

Apa format, references please provide all details of the question. No plagiarism please 
What are business rules, what is their source? and why are they crucial in defining entities, relationships and attributes?  Provide a few examples of business rules for a business that you are familiar with for example a university, a banking system or any business of your choice.
Please list your reference/s 

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