http://www.nlm.nih.gov/medlineplus/phobias.html#cat59

http://kidshealth.org/teen/your_mind/mental_health/phobias.html

http://www.ncbi.nlm.nih.gov/sites/entrez?cmd=search&db=pubmed&term=(phobic+disorders[majr]+OR+agoraphobia[majr])+AND+english[la]+NOT+letter[pt]&doptcmdl=summary&cmd_current=Limits&pmfilter_EDatLimit=last+1+Year&tool=MedlinePlus

http://web4health.info/en/answers/phobia-treat-snake-nopict.htm

http://web4health.info/en/answers/anx-phobias-general.htm

http://apahelpcenter.org/articles/article.php?id=46

http://psychclassics.yorku.ca/Watson/emotion.htm