Gaya APA

Ashford, N, J., Wright, P, H. (1989). Transportation engineering: planing and design (Ed. 3). United States of America: John Willey and Sons.

Gaya MLA

Ashford, Norman, J.., Wright, Paul, H.. "Transportation engineering: planing and design". Ed. 3 United States of America: John Willey and Sons, 1989. Printed Book.