Ng SH, Tan NJ, Luo Y, Goh WS, Ho R, Ho CS (August 2021). "A Systematic Review of Youth and Teen Mental Health First Aid: Improving Adolescent Mental Health". The Journal of Adolescent Health. 69 (2): 199–210. doi:10.1016/j.jadohealth.2020.10.018. PMID33221189. S2CID227131505.
Ng SH, Tan NJ, Luo Y, Goh WS, Ho R, Ho CS (August 2021). "A Systematic Review of Youth and Teen Mental Health First Aid: Improving Adolescent Mental Health". The Journal of Adolescent Health. 69 (2): 199–210. doi:10.1016/j.jadohealth.2020.10.018. PMID33221189. S2CID227131505.
Ng SH, Tan NJ, Luo Y, Goh WS, Ho R, Ho CS (August 2021). "A Systematic Review of Youth and Teen Mental Health First Aid: Improving Adolescent Mental Health". The Journal of Adolescent Health. 69 (2): 199–210. doi:10.1016/j.jadohealth.2020.10.018. PMID33221189. S2CID227131505.