MLA

Necas, Jindrich, et al. Direct Methods In the Theory of Elliptic Equations. Springer Berlin Heidelberg, 2012.

APA

Necas, J., Kufner, A., Necasová, S., Simader, C. G, & Tronel, G. (2012). Direct Methods in the Theory of Elliptic Equations. Springer Berlin Heidelberg.

Chicago

Necas, Jindrich, Alois Kufner, Sárka Necasová, Christian G Simader, and Gerard Tronel. Direct Methods In the Theory of Elliptic Equations. : Springer Berlin Heidelberg, 2012.