Cita APA (7th ed.)
Bernstein, E. 1979 Medical and Health Annual. Encyclopaedia Britannica.
Cita Chicago (17th ed.)
Bernstein, Ellen. 1979 Medical and Health Annual. Chicago, EUA: Encyclopaedia Britannica.
Cita MLA (9th ed.)
Bernstein, Ellen. 1979 Medical and Health Annual. Encyclopaedia Britannica.
Atenció: Aquestes cites poden no estar 100% correctes.