APA引文

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

芝加哥风格引文

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

MLA引文

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

警告：这些引文格式不一定是100％准确.