Armfield, Jason M. ; Mattiske, Julie K. “Vulnerability representation: The role of perceived dangerousness, uncontrollability, unpredictability and disgustingness in spider fear.” Behaviour Research and Therapy, Vol.34(11), 1996, pp.899-909.
Fredrikson, Mats, Annas Peter, Wik, Gustav. “Parental history, aversive exposure and the development of snake and spider phobia in women.” Behaviour Research and Therapy, Vol.35(1), 1997, pp.23-28.