Alexander Pope, Alexander Chalmers (1807). “A Supplementary Volume to the Works of Alexander Pope, Esq: Containing Pieces of Poetry, Not Inserted in Warburton's and Warton's Editions : and a Collection of Letters, Now First Published”, p.120
Aldo Leopold, J. Baird Callicott, Eric T. Freyfogle (2001). “For the Health of the Land: Previously Unpublished Essays And Other Writings”, p.189, Island Press