Cita APA (7a ed.)
Friedman, D. After 9-11: An Engineer's Work at the World Trade Center. Xlibris.
Cita estilo Chicago (17a ed.)
Friedman, Donald. After 9-11: An Engineer's Work at the World Trade Center. Bloomington, EUA: Xlibris.
Cita MLA (9a ed.)
Friedman, Donald. After 9-11: An Engineer's Work at the World Trade Center. Xlibris.
Precaución: Estas citas no son 100% exactas.