European Ecology Symposium Wageningen, Netherlands, Eijsackers, H., & Quispel, A. (1988). Ecological implications of contemporary agriculture: Proceedings of the 4th European Ecology Symposium, 7-12 September 1986, Wageningen. Munksgaard International.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)European Ecology Symposium Wageningen, Netherlands, H. Eijsackers, و A. Quispel. Ecological Implications of Contemporary Agriculture: Proceedings of the 4th European Ecology Symposium, 7-12 September 1986, Wageningen. Copenhagen: Munksgaard International, 1988.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)European Ecology Symposium Wageningen, Netherlands, et al. Ecological Implications of Contemporary Agriculture: Proceedings of the 4th European Ecology Symposium, 7-12 September 1986, Wageningen. Munksgaard International, 1988.