Παραπομπή σε μορφή APA (7η εκδ.)

Halim, S., & Halim, F. (2020). Competitive programming 4: The lower bound of programming contests in the 2020s. Ingram content group.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Halim, Steven, και Felix Halim. Competitive Programming 4: The Lower Bound of Programming Contests in the 2020s. United States, UK: Ingram content group, 2020.

Παραπομπή σε μορφή MLA (8th εκδ.)

Halim, Steven, και Felix Halim. Competitive Programming 4: The Lower Bound of Programming Contests in the 2020s. Ingram content group, 2020.