Snel, J., & Tieges, Z. (2003). Caffeine and wakefulness. In A. L. van Bemmel, D. G. M. Beersma, W. F. Hofman, G. S. F. Ruigt, & P. J. E. Vos (Eds.), Sleep-Wake Research in the Netherlands (pp. 92-94)

van Eekelen, A. P. J., Kerkhof, G. A., & van Amsterdam, J. G. C. (2003). Circadian variation in cortisol reactivity to an acute stressor. In A. L. van Bemmel, D. G. M. Beersma, W. F. Hofman, G. S. F. Ruigt, & P. J. E. Vos (Eds.), Sleep-Wake Research in The Netherlands (Vol. 14, pp. 33-36). Leiden University Press.

Snel, J. (2003). Wat een verstand! AdFundum, 11(3), 14-15.

Snel, J. (2003). Werk en alcohol! AdFundum, 11(4), 12-13.

Snel, J. (2003). Een hard gelach! AdFundum, 11(4), 12-13.

Snel, J. (2003). Succes en falen! AdFundum, 11(9), 14-15.

Snel, J. (2003). Sex en alcohol. AdFundum, 11(10), 18-19.

Snel, J. (2003). Dikdoenerij. AdFundum, 11(11), 10-11.

Bierman, D. J., & Walker, E. H. (2003). Conciousness collaps of the statevector as direct support for the quantum observational theory. In 46th PA Convention (pp. 352-365).

de Jong, R. G., Houtgast, T., Franssen, E. A. M., & Hofman, W. F. (2003). Proceedings of the 8th International Congress on Noise as a Public Health Problem. Foundation ICBEN.