Gaya APA

Punmia, B., Swanson, C, P. (NULL). Strenght of materials and mechanics of structures volume I . New: New Delhi: Standard; 1991.

Gaya MLA

Punmia, B.C.., Swanson, Carl, P.. "Strenght of materials and mechanics of structures volume I". New: New Delhi: Standard; 1991, NULL. Text.