Παραπομπή σε μορφή APA (7η εκδ.)

Carl, S., Khoi, V. L., & Motreanu, D. (2007). Nonsmooth Variational Problems and Their Inequalities: Comparison Principles and Applications. Springer US.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Carl, Siegfried, Vy Le Khoi, και Dumitru Motreanu. Nonsmooth Variational Problems and Their Inequalities: Comparison Principles and Applications. Boston, MA: Springer US, 2007.

Παραπομπή σε μορφή MLA (8th εκδ.)

Carl, Siegfried, et al. Nonsmooth Variational Problems and Their Inequalities: Comparison Principles and Applications. Springer US, 2007.