Cita APA (7a ed.)

(1938). Britannica book of the year. Encyclopaedia Britannica.

Cita Chicago Style (17a ed.)

Britannica Book of the Year. Chicago [etc.]: Encyclopaedia Britannica, 1938.

Cita MLA (9a ed.)

Britannica Book of the Year. Encyclopaedia Britannica, 1938.