Cummings, M. M., & Roos, C. (1969). Dr. John Shaw Billings and The American Climatological Association. American Clinical and Climatological Association.
استشهاد بنمط شيكاغوCummings, M. M., و C. Roos. Dr. John Shaw Billings and The American Climatological Association. American Clinical and Climatological Association, 1969.
MLA استشهادCummings, M. M., و C. Roos. Dr. John Shaw Billings and The American Climatological Association. American Clinical and Climatological Association, 1969.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.