1. Auden, W.H. Foreword. A Mask for Janus, by W.S. Merwin, Yale University Press, 1952, pp. xii–xi.
2. Blaustein, George. Nightmare Envies: Nightmare Envy and Other Stories: American Culture and European Reconstruction. Oxford University Press, 2018.
3. Cain, William E. and Mary Jewett Gaiser. F.O. Matthiessen and the Politics of Criticism. University of Wisconsin Press, 1988.
4. Clark, Heather. Red Comet: The Short Life and Blazing Art of Sylvia Plath. Jonathan Cape, 2020.
5. Davis, Cheri. W.S. Merwin. Twayne, G K Hall, 1981.