APA Style

Henry, O. et al (2019). SASMO (Singapore and Asian Schools Math Olympiad) Secondary 2 [Grade 8] Math Competitions 2014 to 2018 contest problems with full solutions (1st edtion). Singapore: Singapore International Mastery Contests Centre (SIMCC).

MLA Style

Henry, Ong. et al. "SASMO (Singapore and Asian Schools Math Olympiad) Secondary 2 [Grade 8] Math Competitions 2014 to 2018 contest problems with full solutions". 1st edtion Singapore: Singapore International Mastery Contests Centre (SIMCC), 2019. Reference.