Cita APA (7a ed.)
Pytel, A., & Singer, F. L. (1999). Strength of materials (4th ed.). Addison-Wesley.
Cita Chicago Style (17a ed.)
Pytel, Andrew, y Ferdinand L. Singer. Strength of Materials. 4th ed. Harlow: Addison-Wesley, 1999.
Cita MLA (9a ed.)
Pytel, Andrew, y Ferdinand L. Singer. Strength of Materials. 4th ed. Addison-Wesley, 1999.
Precaución: Estas citas no son 100% exactas.