APA (7th ed.) Citation

Halpern, J. P. (1988). Variable spectra of active galaxies: Final technical report. National Aeronautics and Space Administration, George C. Marshall Space Flight Center.

Chicago Style (17th ed.) Citation

Halpern, Jules P. Variable Spectra of Active Galaxies: Final Technical Report. Marshall Space Flight Center, AL: National Aeronautics and Space Administration, George C. Marshall Space Flight Center, 1988.

MLA (9th ed.) Citation

Halpern, Jules P. Variable Spectra of Active Galaxies: Final Technical Report. National Aeronautics and Space Administration, George C. Marshall Space Flight Center, 1988.