Zeelenberg, R., Pecher, D., & Raaijmakers, J. G. W. (2003). Associative repetition priming: A selective review and theoretical implications. In J. S. Bowers, & C. S. Marsolek (Eds.), Rethinking implicit memory (pp. 261-283). Oxford University Press.

Smits, M. G., van Stel, H. F., van der Heijden, K., Meijer, A. M., Coenen, A. M. L., & Kerkhof, G. A. (2003). Melatonin improves health status and sleep in children with idiopathic chronic sleep-onset insomnia: a randomized placebo-controlled trial. In A. L. van Bemmel, D. G. M. Beersma, W. F. Hofman, G. D. F. Ruigt, & P. J. E. Vos (Eds.), Sleep-Wake Research in The Netherlands (pp. 88-91). Leiden University Press.

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.