Παραπομπή σε μορφή APA (7η εκδ.)

Langtangen, H. P., & Mardal, K. (2019). Introduction to Numerical Methods for Variational Problems (1st ed. 2019.). Springer International Publishing : Imprint: Springer. https://doi.org/10.1007/978-3-030-23788-2

Παραπομπή σε μορφή Chicago (17η εκδ.)

Langtangen, Hans Petter, και Kent-Andre Mardal. Introduction to Numerical Methods for Variational Problems. 1st ed. 2019. Cham: Springer International Publishing : Imprint: Springer, 2019. https://doi.org/10.1007/978-3-030-23788-2.

Παραπομπή σε μορφή MLA (8th εκδ.)

Langtangen, Hans Petter, και Kent-Andre Mardal. Introduction to Numerical Methods for Variational Problems. 1st ed. 2019. Springer International Publishing : Imprint: Springer, 2019. https://doi.org/10.1007/978-3-030-23788-2.