MLA

An Excellent New Ballad to the Tune of, How Unhappy Is Phillis in Love. and are to be sold by Langley Curtis,, Printed for Benjamin Harris at the Stationers Arms at the Royal exchange : 1681. https://collections.library.yale.edu/catalog/11378447.

APA, 6th edition

An excellent new ballad to the tune of, How unhappy is Phillis in love. (1681). [Broadside poems]. and are to be sold by Langley Curtis,, Printed for Benjamin Harris at the Stationers Arms at the Royal exchange : https://collections.library.yale.edu/catalog/11378447.