APA Style

Henry, O., Merlan, N. (2021). SASMO (Singapore and Asian Schools Math Olympiad) Primary 5 [Grade 5] Math Competitions 2019 to 2020 contest problems with full solutions (1st edtion). Singapore: Singapore International Mastery Contests Centre (SIMCC).

MLA Style

Henry, Ong., Merlan, Nagiduilin. "SASMO (Singapore and Asian Schools Math Olympiad) Primary 5 [Grade 5] Math Competitions 2019 to 2020 contest problems with full solutions". 1st edtion Singapore: Singapore International Mastery Contests Centre (SIMCC), 2021. Reference.