Alert your reader in the text that you are citing Milton's "Paradise Lost." Be sure to italicize the title in the text; even though "Paradise Lost" is poetry, it is considered a major work.
List the number of the book you are citing, and the number of the line. These should be enclosed in parentheses and separated by a period. For example:
(1.1)
If you are quoting more than one line, provide the range. For example:
(1.1-8)
Position your citation directly after the quote. Your citation should fall outside of the quotation marks, but should precede the period at the end of your quote. For example:
In Milton's Paradise Lost, the angel Gabriel states that "Providence may e'er / be undone righteously" (2.19-20).