Ahuja, T. (1978). Roads, railways bridges and tunnel engineering (5th ed.). Standard book House.
Citazione stile Chigago Style (17a edizione)Ahuja, T.D. Roads, Railways Bridges and Tunnel Engineering. 5th ed. Delhi: Standard book House, 1978.
Citatione MLA (9a ed.)Ahuja, T.D. Roads, Railways Bridges and Tunnel Engineering. 5th ed. Standard book House, 1978.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.