Christiansen, Sofus. 1981. “Brian D. Clark, Ronald Bisset & Peter Wathern: ENVIRONMENTAL IMPACT ASSESSMENT A Bibliography With Abstracts. London 1980, VI, 516 s., ill., 23 Cm, £ 23.50. Mansell Publishing.”. Geografisk Tidsskrift 81 (januar). https://tidsskrift.dk/geografisktidsskrift/article/view/45245.