@incollection{E910001-008,
  author 	 = {William Butler Yeats},
  title 	 = {To a Shade},
  editor 	 = {William Butler Yeats},
  booktitle 	 = {Responsibilities and other Poems},
  publisher 	 = {The Macmillan Company},
  address 	 = {New York},
  date 	 = {1916},
  number 	 = {36–38}
}