Cita APA

Javna, J., Javna, S., & Javna, J. (2008). 50 simple things you can do to save the Earth. Hyperion.

Citación estilo Chicago

Javna, John, Sophie Javna, and Jesse Javna. 50 Simple Things You Can Do to Save the Earth. New York: Hyperion, 2008.

Cita MLA

Javna, John, et al. 50 Simple Things You Can Do to Save the Earth. Hyperion, 2008.