APA (7th ed.) Citation

Loomis, W. F. (1988). Four billion years: An essay on the evolution of genes and organisms. Sinauer Associates, Inc..

Chicago Style (17th ed.) Citation

Loomis, William F. Four Billion Years: An Essay on the Evolution of Genes and Organisms. Sunderland, Mass.: Sinauer Associates, Inc., 1988.

MLA (9th ed.) Citation

Loomis, William F. Four Billion Years: An Essay on the Evolution of Genes and Organisms. Sinauer Associates, Inc., 1988.