Gaya APA
Ahuja, T, D., Birdi, G. (1982).
Roads, Railways bridges and Tunsued engineering (7th ed.).
New Delhi:
Rajiader Kumar Jain Studard Book house.
Gaya MLA
Ahuja, T., D.., Birdi, G.S..
"Roads, Railways bridges and Tunsued engineering".
7th ed.
New Delhi:
Rajiader Kumar Jain Studard Book house,
1982.
Text.