(1982). 1983: Yearbook of science and the future. Encyclopaedia Britannica.
Chicago Style aipamena1983: Yearbook of Science and the Future. Chicago: Encyclopaedia Britannica, 1982.
MLA aipamena1983: Yearbook of Science and the Future. Encyclopaedia Britannica, 1982.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.