Παραπομπή APA

Marshak, S. (2012). Earth: : portrait of a planet.Ed.4. W.W.Norton and company.

Παραπομπή Chicago Style

Marshak, Stephen. Earth: : Portrait of a Planet.Ed.4. New York: W.W.Norton and company, 2012.

Παραπομπή MLA

Marshak, Stephen. Earth: : Portrait of a Planet.Ed.4. W.W.Norton and company, 2012.