Cita APA (7th ed.)
Pytel, A., & Singer, F. L. (1999). Strength of materials (4th ed.). Addison-Wesley.
Cita Chicago (17th ed.)
Pytel, Andrew, i Ferdinand L. Singer. Strength of Materials. 4th ed. Harlow: Addison-Wesley, 1999.
Cita MLA (9th ed.)
Pytel, Andrew, i Ferdinand L. Singer. Strength of Materials. 4th ed. Addison-Wesley, 1999.
Atenció: Aquestes cites poden no estar 100% correctes.