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Nutt, D.; King, L.A.; Saulsbury, C.; Blakemore, Colin (March 2007). "Development of a rational scale to assess the harm of drugs of potential misuse". Lancet. 369 (9566): 1047–53. doi:10.1016/S0140-6736(07)60464-4. PMID17382831. S2CID5903121.
Manghi, Rita Annoni; Broers, Barbara; Khan, Riaz; Benguettat, Djamel; Khazaal, Yasser; Zullino, Daniele Fabio (2009). "Haight-Ashbury Free Medical Clinic". Journal of Psychoactive Drugs. 41 (1): 1–10. doi:10.1080/02791072.2009.10400669. PMID19455904. S2CID30637165.
Nutt, D.; King, L.A.; Saulsbury, C.; Blakemore, Colin (March 2007). "Development of a rational scale to assess the harm of drugs of potential misuse". Lancet. 369 (9566): 1047–53. doi:10.1016/S0140-6736(07)60464-4. PMID17382831. S2CID5903121.
Manghi, Rita Annoni; Broers, Barbara; Khan, Riaz; Benguettat, Djamel; Khazaal, Yasser; Zullino, Daniele Fabio (2009). "Haight-Ashbury Free Medical Clinic". Journal of Psychoactive Drugs. 41 (1): 1–10. doi:10.1080/02791072.2009.10400669. PMID19455904. S2CID30637165.
"Protected Trees"(PDF). Department of Water Affairs and Forestry, Republic of South Africa. 3 May 2013. คลังข้อมูลเก่าเก็บจากแหล่งเดิม(PDF)เมื่อ 5 July 2010.