Czyzak, S. J., Aller, L. H., & Kaler, J. B. (1971). Spectrophotometric studies of gaseous nebulae XIX: The moderate-excitation planetary NGC 6826. University of California.
Chicago Style (17th ed.) CitationCzyzak, S. J., Lawrence Hugh Aller, and James B. Kaler. Spectrophotometric Studies of Gaseous Nebulae XIX: The Moderate-excitation Planetary NGC 6826. Los Angeles: University of California, 1971.
MLA (9th ed.) CitationCzyzak, S. J., et al. Spectrophotometric Studies of Gaseous Nebulae XIX: The Moderate-excitation Planetary NGC 6826. University of California, 1971.
Warning: These citations may not always be 100% accurate.