Gaya APA

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

Gaya MLA

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