Spiegel, L., & Spiegel, L. (1986). Applied Structural Steel Design Leonard Spiegel And George F. Limbrunner. Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)Spiegel, Leonard, agus Leonard Spiegel. Applied Structural Steel Design Leonard Spiegel And George F. Limbrunner. Prentice-Hall, 1986.
Lua MLA (8ú heag.)Spiegel, Leonard, agus Leonard Spiegel. Applied Structural Steel Design Leonard Spiegel And George F. Limbrunner. Prentice-Hall, 1986.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.