Cita APA (7th ed.)
Weber, T. P., & Shelley, B. L. (1978). The future explored. Victor Books.
Cita Chicago (17th ed.)
Weber, Timothy P., i Bruce L. Shelley. The Future Explored. Wheaton, Ill.: Victor Books, 1978.
Cita MLA (9th ed.)
Weber, Timothy P., i Bruce L. Shelley. The Future Explored. Victor Books, 1978.
Atenció: Aquestes cites poden no estar 100% correctes.