*Based on ISI - Thomson - Reuters Web of Science [305].aRanked by total number of citations received by all editions in all years (from year of publication until 31 December 2011).bFor identification purposes: only the first authors and an abbreviated title are mentioned; the full reference is provided in the list of references.cAll editions, except for Hill's Principles of medical statistics.c1dYears elapsed from first edition until the end of 2011.eSimple average from year of publication until 31 December 2011 (all editions).fThe data source does not allow to distinguish citations to each volume.gWhile only the main editions are mentioned in the Table and References, citations to all editions were counted.hThe corresponding (identical) journal article [337] received 2369 citations.