Should I include line numbers in an MLA poetry citation?

Only use line numbers in an MLA in-text citation if the lines are numbered in the original source. If so, write “lines” in the first citation of the poem, and only the numbers in subsequent citations.

If there are no line numbers in the source, you can use page numbers instead. If the poem appears on only one page of a book (or on a website), don’t include a number in the citation.