(1981). 1981: Britannica book of the year. Encyclopaedia Britannica.
Citación estilo Chicago1981: Britannica Book of the Year. Chicago: Encyclopaedia Britannica, 1981.
Cita MLA1981: Britannica Book of the Year. Encyclopaedia Britannica, 1981.
Warning: These citations may not always be 100% accurate.