Cita APA

Simpson, G. G., & Bcek, W. S. Life: An introduction to biology / George Gaylord , William S. Beck. NewYork : Harcourt, Brace World.

Citación estilo Chicago

Simpson, George Gaylord, y William S. Bcek. Life: An Introduction to Biology / George Gaylord , William S. Beck. NewYork : Harcourt, Brace World.

Cita MLA

Simpson, George Gaylord, y William S. Bcek. Life: An Introduction to Biology / George Gaylord , William S. Beck. NewYork : Harcourt, Brace World.