Cita APA (7a ed.)
Calhoun, D. 1990 Yearbook of Science and the Future. Encyclopaedia Britannica.
Cita estilo Chicago (17a ed.)
Calhoun, David. 1990 Yearbook of Science and the Future. Chicago, EUA: Encyclopaedia Britannica.
Cita MLA (9a ed.)
Calhoun, David. 1990 Yearbook of Science and the Future. Encyclopaedia Britannica.
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