Schmidt, R. E., & Campbell, M. E. (1956). Highway traffic estimation. Eno Foundation for Highway Traffic Control.
Citazione stile Chigago Style (17a edizione)Schmidt, Robert E., e M. Earl Campbell. Highway Traffic Estimation. Saugatuck, Conn.: Eno Foundation for Highway Traffic Control, 1956.
Citatione MLA (8a ed.)Schmidt, Robert E., e M. Earl Campbell. Highway Traffic Estimation. Eno Foundation for Highway Traffic Control, 1956.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.