Gaya APA

Adler, M, J. et al (2007). Great books of the Western World 15 : Ptolemy, The Almagest; Nicolaus Copernicus, On the revolutions of the heavenly spheres; Johannes Kepler, Epitome of Copernican astronomy IV-V, The harmonies of the world V (2nd ed.). Chicago: Encyclopaedia Britannica, Inc..

Gaya MLA

Adler, Mortimer, J.. et al. "Great books of the Western World 15 : Ptolemy, The Almagest; Nicolaus Copernicus, On the revolutions of the heavenly spheres; Johannes Kepler, Epitome of Copernican astronomy IV-V, The harmonies of the world V". 2nd ed. Chicago: Encyclopaedia Britannica, Inc., 2007. Text.