Cita APA (7a ed.)
Bernstein, E. 1981 Medical and Health Annual. Encyclopaedia Britannica.
Cita estilo Chicago (17a ed.)
Bernstein, Ellen. 1981 Medical and Health Annual. Chicago, EUA: Encyclopaedia Britannica.
Cita MLA (9a ed.)
Bernstein, Ellen. 1981 Medical and Health Annual. Encyclopaedia Britannica.
警告：这些引文格式不一定是100％准确.