APA Style

Henry, O., Merlan, N. (2021). SASMO (Singapore and Asian Schools Math Olympiad) Secondary 2 [Grade 8] Math Competitions 2019 to 2020 contest problems with full solutions (1st edtion). Singapore: Singapore International Math Contests Center.

MLA Style

Henry, Ong., Merlan, Nagiduilin. "SASMO (Singapore and Asian Schools Math Olympiad) Secondary 2 [Grade 8] Math Competitions 2019 to 2020 contest problems with full solutions". 1st edtion Singapore: Singapore International Math Contests Center, 2021. Reference.