APA (7th ed.) Citation

Ptolemaeus, C. 1., & Humbach, H. (1998). Geography, book 6: Middle East, Central and North Asia, China. Reichert.

Chicago Style (17th ed.) Citation

Ptolemaeus, Claudius 100-178, and Helmut Humbach. Geography, Book 6: Middle East, Central and North Asia, China. Wiesbaden: Reichert, 1998.

MLA (8th ed.) Citation

Ptolemaeus, Claudius 100-178, and Helmut Humbach. Geography, Book 6: Middle East, Central and North Asia, China. Reichert, 1998.

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