APA
Gupta B.L, . (1985). Road Railway Bridges and Tunnel Engineering. New Delhi: Standard Publications, Delhi.
Chicago
Gupta B.L, . 1985. Road Railway Bridges and Tunnel Engineering. New Delhi: Standard Publications, Delhi.
Harvard
Gupta B.L, . (1985). Road Railway Bridges and Tunnel Engineering. New Delhi: Standard Publications, Delhi.
MLA
Gupta B.L, . Road Railway Bridges and Tunnel Engineering. New Delhi: Standard Publications, Delhi. 1985.