Cita APA (7th ed.)
Friedman, D. After 9-11: An Engineer's Work at the World Trade Center. Xlibris.
Cita Chicago (17th ed.)
Friedman, Donald. After 9-11: An Engineer's Work at the World Trade Center. Bloomington, EUA: Xlibris.
Cita MLA (9th ed.)
Friedman, Donald. After 9-11: An Engineer's Work at the World Trade Center. Xlibris.
Atenció: Aquestes cites poden no estar 100% correctes.