Intergovernmental Panel on Climate Change – http://www.ipcc.ch/

United Nations Environment Programme – http://www.unep.org/climatechange/

United States Environmental Protection Agency – http://www3.epa.gov/climatechange/

Agriculture, Fisheries and Conservation Department –http://www.afcd.gov.hk/english/quarantine/qua_pesticide/qua_pesticide.html

Food and Environmental Hygiene Department – http://www.fehd.gov.hk/english/safefood/Pcas.html

觀林蟲害控制有限公司 Ivy Pest Control Corporation Limited – https://ipcchk.com

觀林滅床蝨專隊 Ivy Bedbug Control Professionals – https://ipcchk.com/bedbugs

觀林滅白蟻專隊 Ivy Termite Control Professionals – https://ipcchk.com/termites

Department of Health – http://www.chp.gov.hk/en/guideline_infection/346.html

Environmental Protection Department – http://www.iaq.gov.hk/index_eng.asp

The United States Environmental Protection Agency – http://www2.epa.gov/indoor-air-quality-iaq

觀林除甲醛公司 Ivy Indoor Air Quality Improvement Professionals – http://www.iiaqi.com

Tree Management Office (HK) – http://www.trees.gov.hk/en/about_gltms/arboriculture_organisations/

International Society of Arboriculture – http://www.isa-arbor.com/

European Arboricultural Council – http://www.eac-arboriculture.com/en/