APA (7th ed.) Citation

Graßhoff, G. (2014). Ptolemy and Empirical Data. Astroculture, 32-44.

Chicago Style (17th ed.) Citation

Graßhoff, Gerd. "Ptolemy and Empirical Data." Astroculture 2014: 32-44.

MLA (9th ed.) Citation

Graßhoff, Gerd. "Ptolemy and Empirical Data." Astroculture, 2014, pp. 32-44.

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