The Nuttall Encyclopedia
A nurse in "Martin Chuzzlewit," famous for her bulky umbrella, and for confirming her opinions of things by a constant reference to the authority of an imaginary Mrs. Harris.
Wood, James, ed. Entry for 'Gamp, Sarah'. The Nuttall Encyclopedia. https://www.studylight.org/encyclopedias/eng/nut/g/gamp-sarah.html. Frederick Warne & Co Ltd. London. 1900.