Watkins, R. M., & Collin, J. (1985). Deaths from peptic ulceration.
Chicago Style CitationWatkins, R M., i Jack Collin. Deaths From Peptic Ulceration. 1985.
Cita MLAWatkins, R M., i Jack Collin. Deaths From Peptic Ulceration. 1985.
Atenció: Aquestes cites poden no estar 100% correctes.