APA (7th ed.) Citation

Hallo, W. W., & Hudson, M. (2004). Bookkeeping in the 21st Century BCE.

Chicago Style (17th ed.) Citation

Hallo, William W., and M. Hudson. Bookkeeping in the 21st Century BCE. 2004.

MLA (8th ed.) Citation

Hallo, William W., and M. Hudson. Bookkeeping in the 21st Century BCE. 2004.

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