1. Bertie, Peregrine. 1600. Letter to Margaret Clifford. WDHOTH/3/44/6/59. Cumbria Archive Service, Kendal.
2. Clifford, Margaret. 1585. Letter to George Clifford. WDHOTH/3/44/5/1. Cumbria Archive Service, Kendal.
3. ———————. 1591. “Layfield Letter, autobiography.” Portland Papers 23: 1–10. Longleat House, Wiltshire.
4. ———————. 1598. Physick & Alchemye: Receipts of Lady Margaret, for elixirs, tinctures, electuaries, cordials, waters etc. WDHOTH/1/5. Cumbria Archive Service, Kendal.
5. ———————. April 1600. Letter to George Clifford. Portland Papers 23. Longleat House, Wiltshire.