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An introduction to medical statistics Bland 5th edition.  2015 (no date).
My Bookmarks | University College London (no date a). Available at: http://readinglists.ucl.ac.uk/users/6D714FB1-A427-97EF-DBD8-213640E63F66/bookmarks.html.
My Bookmarks | University College London (no date b). Available at: http://readinglists.ucl.ac.uk/users/6D714FB1-A427-97EF-DBD8-213640E63F66/bookmarks.html#.