APA (7th ed.) Citation

Helmer-Hirschberg, O. (1967). Analysis of the future: The delphi method. The Rand Corporation.

Chicago Style (17th ed.) Citation

Helmer-Hirschberg, Olaf. Analysis of the Future: The Delphi Method. Sta. Monica, Ca: The Rand Corporation, 1967.

MLA (9th ed.) Citation

Helmer-Hirschberg, Olaf. Analysis of the Future: The Delphi Method. The Rand Corporation, 1967.