Porteous, I. R. (2001). Geometric differentiation: For the intelligence of curves and surfaces (2nd ed.). Cambridge, UK ; New York: Cambridge University Press.
استشهاد بنمط شيكاغوPorteous, Ian R. Geometric Differentiation: For the Intelligence of Curves and Surfaces. 2nd ed. Cambridge, UK ; New York: Cambridge University Press, 2001.
MLA استشهادPorteous, Ian R. Geometric Differentiation: For the Intelligence of Curves and Surfaces. 2nd ed. Cambridge, UK ; New York: Cambridge University Press, 2001.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.