APA
Bedi D.S, . (1991). strength of materials. : N . Delhi S Chand & comp.
Chicago
Bedi D.S, . 1991. strength of materials. : N . Delhi S Chand & comp.
Harvard
Bedi D.S, . (1991). strength of materials. : N . Delhi S Chand & comp.
MLA
Bedi D.S, . strength of materials. : N . Delhi S Chand & comp. 1991.