APA (7th ed.) Citation

Duke, D. (2005). Ptolemy's treatment of the outer planets.

Chicago Style (17th ed.) Citation

Duke, Dennis. Ptolemy's Treatment of the Outer Planets. 2005.

MLA (9th ed.) Citation

Duke, Dennis. Ptolemy's Treatment of the Outer Planets. 2005.

Warning: These citations may not always be 100% accurate.