Lenk, J. D. (1980). Handbook of controls and instrumentation. Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)Lenk, John D. Handbook of Controls and Instrumentation. Englewood Cliffs, N.J.: Prentice-Hall, 1980.
Lua MLA (9ú heag.)Lenk, John D. Handbook of Controls and Instrumentation. Prentice-Hall, 1980.
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