Constructivism: Man versus Environment : International major event concerning contemporary constructivism.

MLA

Ilgen, Fré, et al. Constructivism: Man Versus Environment : International Major Event Concerning Contemporary Constructivism. 500 copies Dordrecht: Stichting PRO, 1989.

APA

Ilgen, F., Ilgen-van Rooijen, J., Gunst, R., Hengeveld, P., & de Thouars, A. (1989). Constructivism: Man versus Environment : International major event concerning contemporary constructivism. 500 copies Dordrecht: Stichting PRO.

Chicago

Ilgen, Fré, Jacqueline Ilgen-van Rooijen, Ronald Gunst, Pim Hengeveld, and Alexandre de Thouars. Constructivism: Man Versus Environment: International Major Event Concerning Contemporary Constructivism. 500 copies Dordrecht: Stichting PRO, 1989.