Παραπομπή σε μορφή APA (7η εκδ.)

Feltrin, G., & Feltrin, G. (2018). Positive Solutions to Indefinite Problems: A Topological Approach (1st ed. 2018.). Springer International Publishing : Imprint: Birkhäuser. https://doi.org/10.1007/978-3-319-94238-4

Παραπομπή σε μορφή Chicago (17η εκδ.)

Feltrin, Guglielmo, και Guglielmo Feltrin. Positive Solutions to Indefinite Problems: A Topological Approach. 1st ed. 2018. Cham: Springer International Publishing : Imprint: Birkhäuser, 2018. https://doi.org/10.1007/978-3-319-94238-4.

Παραπομπή σε μορφή MLA (8th εκδ.)

Feltrin, Guglielmo, και Guglielmo Feltrin. Positive Solutions to Indefinite Problems: A Topological Approach. 1st ed. 2018. Springer International Publishing : Imprint: Birkhäuser, 2018. https://doi.org/10.1007/978-3-319-94238-4.