SpringerLink (Online service), Gionti, S. J., & Kikwaya Eluo, S. (2018). The Vatican Observatory, Castel Gandolfo: 80th Anniversary Celebration (1st ed. 2018.). Springer International Publishing : Imprint: Springer. https://doi.org/10.1007/978-3-319-67205-2
Παραπομπή σε μορφή Chicago (17η εκδ.)SpringerLink (Online service), S. J. Gionti, και S.J Kikwaya Eluo. The Vatican Observatory, Castel Gandolfo: 80th Anniversary Celebration. 1st ed. 2018. Cham: Springer International Publishing : Imprint: Springer, 2018. https://doi.org/10.1007/978-3-319-67205-2.
Παραπομπή σε μορφή MLA (8th εκδ.)SpringerLink (Online service), et al. The Vatican Observatory, Castel Gandolfo: 80th Anniversary Celebration. 1st ed. 2018. Springer International Publishing : Imprint: Springer, 2018. https://doi.org/10.1007/978-3-319-67205-2.
