A. W. Ward & A. R. Waller (编). Gray's Family and Life. The Cambridge History of English and American Literature in 18 Volumes Volume 10. [15 April 2014]. (原始内容存档于2018-02-22).
A. W. Ward & A. R. Waller (编). Gray's Family and Life. The Cambridge History of English and American Literature in 18 Volumes Volume 10. [15 April 2014]. (原始内容存档于2018-02-22).