Hancock, H. (1917). Theory of maxima and minima. Ginn and company.
Cita Chicago (17th ed.)Hancock, Harris. Theory of Maxima and Minima. Boston : New York [etc.]: Ginn and company, 1917.
Cita MLA (8th ed.)Hancock, Harris. Theory of Maxima and Minima. Ginn and company, 1917.
Atenció: Aquestes cites poden no estar 100% correctes.