Duffus, R. L. (1967). Tomorrow's news: A primer for prophets. Norton.
Cita Chicago (17th ed.)Duffus, Robert Luther. Tomorrow's News: A Primer for Prophets. New York: Norton, 1967.
Cita MLA (9th ed.)Duffus, Robert Luther. Tomorrow's News: A Primer for Prophets. Norton, 1967.
Atenció: Aquestes cites poden no estar 100% correctes.