APA
Duggal S. K., . (20122016). Limit State Design of Steel Structures. New Delhi: TMH.
Chicago
Duggal S K, . 20122016. Limit State Design of Steel Structures. New Delhi: TMH.
Harvard
Duggal S. K., . (20122016). Limit State Design of Steel Structures. New Delhi: TMH.
MLA
Duggal S K, . Limit State Design of Steel Structures. New Delhi: TMH. 20122016.