1. The epidemiology of common fears and phobias;Agras;Compr. Psychiat,1969
2. Prevalence of worry in normal aircrew;Aitken;British Journal of Medical Psychology,1969
3. Diagnostic and statistical manual of mental disorders,1987
4. Diagnostic and statistical manual of mental disorders,1994
5. The prevalence of flight phobia among Icelanders;Arnarson,1987