1.
My Bookmarks | University College London, http://readinglists.ucl.ac.uk/users/6D714FB1-A427-97EF-DBD8-213640E63F66/bookmarks.html.
2.
My Bookmarks | University College London, http://readinglists.ucl.ac.uk/users/6D714FB1-A427-97EF-DBD8-213640E63F66/bookmarks.html#.
3.
An introduction to medical statistics Bland 5th edition.  2015.
4.
Bland, M.: An introduction to medical statistics.