Aller, L. H., & Kaler, J. B. (1964). Spectrophotometric studies of gaseous nebulae III: The low-excitation ring planetary IC 418. University of California.
Chicago Style (17th ed.) CitationAller, Lawrence Hugh, and James B. Kaler. Spectrophotometric Studies of Gaseous Nebulae III: The Low-excitation Ring Planetary IC 418. Los Angeles: University of California, 1964.
MLA (9th ed.) CitationAller, Lawrence Hugh, and James B. Kaler. Spectrophotometric Studies of Gaseous Nebulae III: The Low-excitation Ring Planetary IC 418. University of California, 1964.
Warning: These citations may not always be 100% accurate.