Cita APA (7th ed.)
Pytel, A., & Singer, F. L. (1987). Strength of materials (4th ed.). Addsion-Wesley.
Cita Chicago (17th ed.)
Pytel, Andrew, i Ferdinand Leon Singer. Strength of Materials. 4th ed. california: Addsion-Wesley, 1987.
Cita MLA (9th ed.)
Pytel, Andrew, i Ferdinand Leon Singer. Strength of Materials. 4th ed. Addsion-Wesley, 1987.
Atenció: Aquestes cites poden no estar 100% correctes.