Practical epidemiology /
D. J. P. Barker, with chapters by F. J. Bennett.
- 2d ed.
- Edinburgh ; New York : New York : Edinburgh ; New York : New York : Edinburgh ; New York : New York : Churchill Livingstone ; distributed in the U.S.A. by Longman, Churchill Livingstone ; distributed in the U.S.A. by Longman, 1976.