APA (7th ed.) Citation

Harrison, E. R. (1987). Darkness at night: A riddle of the universe. Harvard University Press.

Chicago Style (17th ed.) Citation

Harrison, Edward Robert. Darkness at Night: A Riddle of the Universe. Cambridge, Mass.: Harvard University Press, 1987.

MLA (9th ed.) Citation

Harrison, Edward Robert. Darkness at Night: A Riddle of the Universe. Harvard University Press, 1987.