Hay, W. W. (1961). An Introduction to tansportation engineering. John Wiley.
Citazione stile Chigago Style (17a edizione)Hay, William W. An Introduction to Tansportation Engineering. NewYork: John Wiley, 1961.
Citatione MLA (9a ed.)Hay, William W. An Introduction to Tansportation Engineering. John Wiley, 1961.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.