Gaya APA

Nachbar, S, F. (1998). Encyclopedia of science 2 : the heavens stars, galaxies, and the solar system . : Macmillan Library Reference.

Gaya MLA

Nachbar, Sondra, F.. "Encyclopedia of science 2 : the heavens stars, galaxies, and the solar system". : Macmillan Library Reference, 1998. Reference.