Hancock, H. (1960). Theory of Maxima and Minima. Dover Publications Inc.
Lua i Stíl Chicago (17ú heag.)Hancock, Harris. Theory of Maxima and Minima. Nueva York: Dover Publications Inc, 1960.
Lua MLA (9ú heag.)Hancock, Harris. Theory of Maxima and Minima. Dover Publications Inc, 1960.
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