APA (7th ed.) Citation

Goldsmith, D. (1997). Worlds unnumbered: The search for extrasolar planets. Univ. Science Books.

Chicago Style (17th ed.) Citation

Goldsmith, Donald. Worlds Unnumbered: The Search for Extrasolar Planets. Sausalito, Calif: Univ. Science Books, 1997.

MLA (9th ed.) Citation

Goldsmith, Donald. Worlds Unnumbered: The Search for Extrasolar Planets. Univ. Science Books, 1997.