1. G.H Mair, English Literature 1450-1900(oxford University Press/London, 1969), PP.113-114
2. Helen Darbishire, The Poet Wordsworth (Oxford University Press/London, 1950), P.29
3. Allen, Pauline Elaine Elaine, “Robert Frost: A Twentieth Century Poet of Man and Nature”(1978)
4. Lawrence Thompson. Robert Frost: The Early Years, 1874-1915. Henry Holt and company, Inc,1966
5. John F.Lynen. The Pastoral Art of Robert Frost. Yale University Press, 1960.
6. Herbert Read, Wordsworth (Faber and Faber Ltd/London, 1949),PP.126-27
7. Graham Hough, The Romantic Poets (Arrow Book Ltd./ London, 1961), P.49
8. French warren, (ed) Twentieth-century American Literature. London: The Macmillan Press Limited, 1980, 218-219
9. George W. Nitchie. Human Values in the Poetry of Robert Frost. Gordian Press, 1978.
10. David Nichol Smit, Introduction to Wordsworth: Poetry and Prose (Oxford University Press/London 1956) P.13.