Katschinski, B. D., & Logan, R. F. (1991). Changes in birth-cohort pattern of peptic ulcer mortality in England and Wales. BMJ Group.
استشهاد بنمط شيكاغوKatschinski, B. D., و R. F. Logan. Changes in Birth-cohort Pattern of Peptic Ulcer Mortality in England and Wales. BMJ Group, 1991.
MLA استشهادKatschinski, B. D., و R. F. Logan. Changes in Birth-cohort Pattern of Peptic Ulcer Mortality in England and Wales. BMJ Group, 1991.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.