Barker, J. A. (1992). Future edge: Discovering the new paradigms of success. W. Morrow.
Tohutoru Kātū Chicago (17th ed.)Barker, Joel Arthur. Future Edge: Discovering the New Paradigms of Success. New York: W. Morrow, 1992.
Tohutoro MLA (9th ed.)Barker, Joel Arthur. Future Edge: Discovering the New Paradigms of Success. W. Morrow, 1992.
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