Travis, John (2004). “Fear not: Scientists are learning how people can unlearn fear”. 《Science News》 165 (3): 42–44. doi:10.2307/4014925. JSTOR4014925.
Travis, John (2004). “Fear not: Scientists are learning how people can unlearn fear”. 《Science News》 165 (3): 42–44. doi:10.2307/4014925. JSTOR4014925.