APA (7th ed.) Citation

Roberson, C. W., & Sprangle, P. (1990). A review of free electron lasers. NRL.

Chicago Style (17th ed.) Citation

Roberson, C. W., and P. Sprangle. A Review of Free Electron Lasers. [Washington, D.C.?]: NRL, 1990.

MLA (9th ed.) Citation

Roberson, C. W., and P. Sprangle. A Review of Free Electron Lasers. NRL, 1990.