Greenlees. When the Air Became Important. Rutgers University Press.
Čikaški stil citiranja (17. izdanje)Greenlees. When the Air Became Important. Rutgers University Press.
MLA način citiranja (9. izdanje)Greenlees. When the Air Became Important. Rutgers University Press.
Upozorenje: Ovi citati možda nisu uvijek 100% točni.