Cita APA (7a ed.)
Calhoun, D. 1977 [i.e. Nineteen Seventy-Seven] Yearbook of Science and the Future. Encyclopaedia Britannica.
Cita estilo Chicago (17a ed.)
Calhoun, David. 1977 [i.e. Nineteen Seventy-Seven] Yearbook of Science and the Future. Chicago, EUA: Encyclopaedia Britannica.
Cita MLA (9a ed.)
Calhoun, David. 1977 [i.e. Nineteen Seventy-Seven] Yearbook of Science and the Future. Encyclopaedia Britannica.
Precaución: Estas citas no son 100% exactas.