Dyfyniad APA

Linstone, H. A., Simmonds, W. H. C., & Bäckstrand, G. (1977). Futures research: New directions. Addison-Wesley Pub. Co., Advanced Book Program.

Dyfyniad Arddull Chicago

Linstone, Harold A., Walter Henry Clive Simmonds, and Göran Bäckstrand. Futures Research: New Directions. Reading, Mass.: Addison-Wesley Pub. Co., Advanced Book Program, 1977.

Dyfyniad MLA

Linstone, Harold A., et al. Futures Research: New Directions. Addison-Wesley Pub. Co., Advanced Book Program, 1977.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.