APA-Zitierstil (7. Ausg.)

Kaler, J. B., & Aller, L. H. (1974). The expansion and possible structure of the planetary nebula NGC 2440. University of California.

Chicago-Zitierstil (17. Ausg.)

Kaler, James B., und Lawrence Hugh Aller. The Expansion and Possible Structure of the Planetary Nebula NGC 2440. Los Angeles: University of California, 1974.

MLA-Zitierstil (9. Ausg.)

Kaler, James B., und Lawrence Hugh Aller. The Expansion and Possible Structure of the Planetary Nebula NGC 2440. University of California, 1974.