MLA

Demengel, Françoise, Gilbert Demengel, and Reinie Erné. Functional Spaces for the Theory of Elliptic Partial Differential Equations. Springer London, 2012.

APA

Demengel, F., Demengel, G., & Erné, R. (2012). Functional Spaces for the Theory of Elliptic Partial Differential Equations. Springer London.

Chicago

Demengel, Françoise, Gilbert Demengel, and Reinie Erné. Functional Spaces for the Theory of Elliptic Partial Differential Equations. : Springer London, 2012.