Halberg, C. J. A., & Devlin, J. F. (1967). Elementary functions. Scott, Foresman.
Lua i Stíl Chicago (17ú heag.)Halberg, Charles J. A., agus John F. Devlin. Elementary Functions. Atlanta: Scott, Foresman, 1967.
Lua MLA (8ú heag.)Halberg, Charles J. A., agus John F. Devlin. Elementary Functions. Scott, Foresman, 1967.
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