Surkyn, J., Deboosere, P., Bavel, J. V., Willekens, F., & Koloriet, S. (2008). Demographic challenges for the 21st century: A state of the art in demography : conference organized as a tribute to the continuing endeavours of Prof. Dr. Em. Ron Lesthaeghe in the field of demography. Brussels, Belgium: VUBPress.

Surkyn, J., Patrick Deboosere, Jan Van Bavel, Frans Willekens, and Sterrebeek Koloriet. Demographic Challenges for the 21st Century: A State of the Art in Demography : Conference Organized As a Tribute to the Continuing Endeavours of Prof. Dr. Em. Ron Lesthaeghe in the Field of Demography. Brussels, Belgium: VUBPress, 2008.

Surkyn, J., et al. Demographic Challenges for the 21st Century: A State of the Art in Demography : Conference Organized As a Tribute to the Continuing Endeavours of Prof. Dr. Em. Ron Lesthaeghe in the Field of Demography. Brussels, Belgium: VUBPress, 2008.