Gaya APA

LEHRI, R, S. (1978). STRENGTH OF MATERIALS (MECHANICS OF MATERIALS) . LUDHIANA: B. D. Kataria & Sons.

Gaya MLA

LEHRI, Raghbir, Singh.. "STRENGTH OF MATERIALS (MECHANICS OF MATERIALS)". LUDHIANA: B. D. Kataria & Sons, 1978. Textbook.