APA
Duggal S.K, . (2014). Design of steel structures. : N D Mcgrewhill.
Chicago
Duggal S.K, . 2014. Design of steel structures. : N D Mcgrewhill.
Harvard
Duggal S.K, . (2014). Design of steel structures. : N D Mcgrewhill.
MLA
Duggal S.K, . Design of steel structures. : N D Mcgrewhill. 2014.