APA

Graff E. A. B., Vermeer Adri, Heymans Hugo S A & Schuurman Martin I M. (1998). Down syndrome behind the dykes. Amsterdam: VU University Press.

Chicago

Graff Erik A B, Vermeer Adri, Heymans Hugo S A and Schuurman Martin I M. 1998. Down syndrome behind the dykes. Amsterdam: VU University Press.

Harvard

Graff E. A. B., Vermeer Adri, Heymans Hugo S A and Schuurman Martin I M. (1998). Down syndrome behind the dykes. Amsterdam: VU University Press.

MLA

Graff Erik A B, Vermeer Adri, Heymans Hugo S A and Schuurman Martin I M. Down syndrome behind the dykes. Amsterdam: VU University Press. 1998.