S.P., T., & Veer, A. A. d. (1982). Perspective in landscape ecology: Proceedings of the International Congress Organized by the Netherlands Society for landscape ecology, Veldhoven, the Netherlands, April 6-11, 1981. Centre for Agricultural Pub. and Documentation.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)S.P., Tjallingii, و A. A. de Veer. Perspective in Landscape Ecology: Proceedings of the International Congress Organized by the Netherlands Society for Landscape Ecology, Veldhoven, the Netherlands, April 6-11, 1981. Wageningen: Centre for Agricultural Pub. and Documentation, 1982.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)S.P., Tjallingii, و A. A. de Veer. Perspective in Landscape Ecology: Proceedings of the International Congress Organized by the Netherlands Society for Landscape Ecology, Veldhoven, the Netherlands, April 6-11, 1981. Centre for Agricultural Pub. and Documentation, 1982.