Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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