Cita APA (7th ed.)

GRAVA, S. (2002). Urban transportation systems: Choices for communities. McGraw-Hill.

Cita Chicago (17th ed.)

GRAVA, Sigurd. Urban Transportation Systems: Choices for Communities. New York: McGraw-Hill, 2002.

Cita MLA (9th ed.)

GRAVA, Sigurd. Urban Transportation Systems: Choices for Communities. McGraw-Hill, 2002.