The easiest way to shorten this discussion is to be so kind to edit your original post and to add the missing information.

And here is why:

When do you need to cite sources?

Citations are required in all types of academic¹ texts. They are needed for several reasons:

• To avoid plagiarism by indicating when you’re taking information from another source
• To give proper credit to the author of that source
• To allow the reader to consult your sources for themselves]

On a Meta level, please note that I referenced from where I copied that advice, because...

¹) and yes this is strictly speaking not an academy, but monasteries predated universities as centers of wisdom for many centuries.

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