Our Guide To Entering says: When citing or quoting, use direct quotes. Clearly identify author and source. Provide a hyperlink if possible.
You are free to choose a style of referencing that suits you best. A concise overview of referencing styles is given here.
The bibliography is excluded from the word count.
The two parts of the essay are independent of one another. Each should have its own introduction and conclusion. Do not include an overall introduction or conclusion that covers both parts.