There are 3 titles associated with this person.

@book{ wphp_4870
  author={Douglas,Jane},
  year={1767},
  title={Letters from Lady Jane Douglas, found in Lord Milton's repositories, and exhibited upon the 18th June 1767.},
  publisher={s.n. [sine nomine]},
  address={Edinburgh},    }
@book{ wphp_4823
  author={Douglas,Jane},
  year={1767},
  title={Letters of the Right Honourable Lady Jane Douglas; with several other important pieces of private correspondence from all which The Characters of That celebrated lady, and of Her Husband Sir John Stewart, will appear in a light Hitherto not sufficiently known to the World. The Whole drawn from the most Authentic Sources, collected, arranged, and illustrated with notes. Together with an introductory preface, Giving some Account of Lady Jane Douglas; Partly taken from a Case drawn up by Alexander Lockhart Esquire, Dean of the Faculty of Advocates. To which are subjoined, the dying declarations Of Lady Jane Douglas, Sir John Stewart, and their Attendant Mrs. Helen Hewit, Which have been much insisted on in Behalf of Archibald Douglas Esq. With a Cool and Candid Inquiry how far such Declarations should weigh with the rational Part of Mankind.},
  publisher={John Wilkie},
  address={London},    }
@book{ wphp_4836
  author={Douglas,Jane},
  year={1768},
  title={Letters of the Right Honourable Lady Jane Douglas; to her husband Sir John Stewart, Bart. Collected, arranged, and illustrated with Notes. With an introductory preface, extracted from her case drawn up by Alexander Lockhart, Esquire, Dean of the Faculty of Advocates. To which are subjoined, the dying declarations of Lady Jane Douglas, Sir John Stewart, and their attendant Mrs. Helen Hewit.},
  publisher={John Exshaw II [Dame Street]},
  address={Dublin},    }