Citazione APA

Sparke, L. S., & Gallagher, J. S. (2000). Galaxies in the universe: An introduction. Cambridge University Press.

Stile di citazione Chicago

Sparke, Linda Siobhan, e John S. Gallagher. Galaxies in the Universe: An Introduction. New York: Cambridge University Press, 2000.

Citazione MLA

Sparke, Linda Siobhan, e John S. Gallagher. Galaxies in the Universe: An Introduction. Cambridge University Press, 2000.