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