APA (7th ed.) Citation

Helmer, O. (1983). Looking forward: A guide to futures research. Sage Publications.

Chicago Style (17th ed.) Citation

Helmer, Olaf. Looking Forward: A Guide to Futures Research. Beverly Hills, Calif [u.a.]: Sage Publications, 1983.

MLA (8th ed.) Citation

Helmer, Olaf. Looking Forward: A Guide to Futures Research. Sage Publications, 1983.