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2. Gastric acidity: relation to various factors such as age and physical fitness;Bloomfield, A.L.; Keefer, C.S.;J. clin. Invest; Gastric motility and the volume of gastric secretion in man,1928
3. The rationale of selective surgery in the treatment of duodenal ulcer;Bruce, J.; Card, W.I.; Marks, I.N.; Sircus, W.;J. roy. Coll. Surg. Edinb,1959
4. Card, W. I. (1952). In The Principles and Practice of Medicine, p. 635. Edited by L. S. P. Davidson. Livingstone, Edinburgh and London.
5. Gastric secretion of acid in diabetes mellitus during basal conditions and after maximal histamine stimulation;Dotevall, G.;Acta med. scand,1961