Παραπομπή σε μορφή APA (7η εκδ.)

El-Helaly, S., & El-Helaly, S. (2019). The Mathematics of Voting and Apportionment: An Introduction (1st ed. 2019.). Springer International Publishing : Imprint: Birkhäuser. https://doi.org/10.1007/978-3-030-14768-6

Παραπομπή σε μορφή Chicago (17η εκδ.)

El-Helaly, Sherif, και Sherif El-Helaly. The Mathematics of Voting and Apportionment: An Introduction. 1st ed. 2019. Cham: Springer International Publishing : Imprint: Birkhäuser, 2019. https://doi.org/10.1007/978-3-030-14768-6.

Παραπομπή σε μορφή MLA (8th εκδ.)

El-Helaly, Sherif, και Sherif El-Helaly. The Mathematics of Voting and Apportionment: An Introduction. 1st ed. 2019. Springer International Publishing : Imprint: Birkhäuser, 2019. https://doi.org/10.1007/978-3-030-14768-6.