MLA

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