APA (7th ed.) Citation

Stephenson, F. R., Hunger, H., & Yau, K. K. C. (18). Records of Halley's Comet on Babylonian Tablets.

Chicago Style (17th ed.) Citation

Stephenson, F. R., H. Hunger, and K. K. C. Yau. Records of Halley's Comet on Babylonian Tablets. 18.

MLA (8th ed.) Citation

Stephenson, F. R., et al. Records of Halley's Comet on Babylonian Tablets. 18.