Covarianza y contravarianza (Spanish Wikipedia)

Analysis of information sources in references of the Wikipedia article "Covarianza y contravarianza" in Spanish language version.

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Misner, C.; Thorne, K.S.; Wheeler, J.A. (1973). Gravitation. W.H. Freeman. ISBN 0-7167-0344-0.

Sylvester, J.J. (1851). «On the general theory of associated algebraical forms». Cambridge and Dublin Mathematical Journal 6. pp. 289-293.
Bowen, Ray; Wang, C.-C. (2008) [1976]. «§3.14 Reciprocal Basis and Change of Basis». Introduction to Vectors and Tensors. Dover. pp. 78, 79, 81. ISBN 9780486469140.

Frankel, Theodore (2012). The geometry of physics : an introduction. Cambridge: Cambridge University Press. p. 42. ISBN 978-1-107-60260-1. OCLC 739094283.
Sylvester, J.J. University Press. The collected mathematical papers of James Joseph Sylvester. 3, 1870–1883. ISBN 978-1107661431. OCLC 758983870.