Spiegel, L., & Spiegel, L. (1991). Applied Statistics And Strength Of Materials Leonard Spiegel George F. Limbrunner. Macmillan Publishing Company.
Chicago-viite (17. p.)Spiegel, Leonard, ja Leonard Spiegel. Applied Statistics And Strength Of Materials Leonard Spiegel George F. Limbrunner. Macmillan Publishing Company, 1991.
MLA-viite (8. p.)Spiegel, Leonard, ja Leonard Spiegel. Applied Statistics And Strength Of Materials Leonard Spiegel George F. Limbrunner. Macmillan Publishing Company, 1991.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.