Graaf, H. J. d., Keurs, W. J. t., & Musters, C. J. M. (1999). Regional opportunities for sustainable development: Theory, methods, and applications. Kluwer Academic Publishers.
芝加哥风格引文Graaf, H. J. de, W. J. ter Keurs, 与 C. J. M. Musters. Regional Opportunities for Sustainable Development: Theory, Methods, and Applications. Dordrecht ; Boston: Kluwer Academic Publishers, 1999.
MLA引文Graaf, H. J. de, et al. Regional Opportunities for Sustainable Development: Theory, Methods, and Applications. Kluwer Academic Publishers, 1999.
警告：这些引文格式不一定是100％准确.