Gaya APA

Pytel, A., Singer, F, L. (1987). Strength of materials / Andrew Pytel, Ferdinand L. Singer (Ed.ke-4). New York: Harper Collins Publishers.

Gaya MLA

Pytel, Andrew., Singer, Ferdinand, Leon. "Strength of materials / Andrew Pytel, Ferdinand L. Singer". Ed.ke-4 New York: Harper Collins Publishers, 1987. Textbook.