Cita APA

Grava, S. (2003). Urban transportation systems. New York: McGraw-Hill.

Chicago Style Citation

Grava, Sigurd. Urban Transportation Systems. New York: McGraw-Hill, 2003.

Cita MLA

Grava, Sigurd. Urban Transportation Systems. New York: McGraw-Hill, 2003.

Atenció: Aquestes cites poden no estar 100% correctes.