APA (7th ed.) Citation

Guan, Z., & Herrmann, K. (2020). Kao Gong Ji: The World’s Oldest Encyclopaedia of Technologies.

Chicago Style (17th ed.) Citation

Guan, Zengjian, and Konrad Herrmann. Kao Gong Ji: The World’s Oldest Encyclopaedia of Technologies. 2020.

MLA (9th ed.) Citation

Guan, Zengjian, and Konrad Herrmann. Kao Gong Ji: The World’s Oldest Encyclopaedia of Technologies. 2020.

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