Update README.md

README.md

@@ -18,4 +18,8 @@ To open the different files, please follow these instructions:
 
 For tab-separated data files '.txt': These can be opened by any spreadsheet processor (e.g. MS Excel, OpenOffice Calc) or desktop database software (e.g. MS Access). Just open one of the suggested programmes and drag & drop the file into it, or import data by choosing 'tab delimited', CSV, 'text file' or any similar option. If you are asked to select an 'encoding standard' or 'character set' manually, please choose 'Unicode, UTF-8'. NOTE: do not try to double-click on the files, as .txt is a very generic extension and will probably have a generic text viewer associated to it. For xml files '.xml': These files are usually designed to be machine processed. If you are curious about their content, they can normally be interpreted by web browsers: just drag & drop the file into a web browser window. You will require special software if for any reason you want to edit these files manually.
 
-### More info: https://techdocs.gbif.org/en/data-use/download-formats
+### More info: https://techdocs.gbif.org/en/data-use/download-formats
+
+## Reference:
+
+GBIF.org (2024), GBIF Home Page. Available from: https://www.gbif.org [13 January 2020].