The References text field of a writing serves both as a normal text field where references can be put, and also as a more useful memory aid. Any line in it that begins with a number in square brackets can be Ctrl-clicked to add the corresponding reference number to writing's content text. The references thus added to the text will appear in the published version, but without the highlighting style. In the text editing view they the be clicked, which caused corresponding line in the References text field will to be visually highlighted. Between those numbered lines there may be other lines of text which do not have the same functionality, but are just text.