Felbeck, D. K. (1968). Introduction to Strengthening Mechanisms. Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)Felbeck, David K. Introduction to Strengthening Mechanisms. Englewood Cliffs: Prentice-Hall, 1968.
Lua MLA (9ú heag.)Felbeck, David K. Introduction to Strengthening Mechanisms. Prentice-Hall, 1968.
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