Cita APA (7a ed.)

Hay, W. (1989). An introduction to transportation engineering (2a. ed.). Krieger.

Cita Chicago Style (17a ed.)

Hay, William. An Introduction to Transportation Engineering. 2a. ed. Malabar: Krieger, 1989.

Cita MLA (8a ed.)

Hay, William. An Introduction to Transportation Engineering. 2a. ed. Krieger, 1989.