MacMahon, B., & Pugh, T. F. (1970). Epidemiology: Principles and methods. Little, Brown.
Cita Chicago (17th ed.)MacMahon, Brian, i Thomas F. Pugh. Epidemiology: Principles and Methods. Boston: Little, Brown, 1970.
Cita MLA (9th ed.)MacMahon, Brian, i Thomas F. Pugh. Epidemiology: Principles and Methods. Little, Brown, 1970.
Atenció: Aquestes cites poden no estar 100% correctes.