Wicherts, I. S., Boeke, A. J. P., van der Meer, I. M., van Schoor, N. M., Knol, D. L., & Lips, P. (2010). Sunlight exposure or vitamin D supplementation for vitamin D-deficient non-western immigrants: A randomized clinical trial. Springer-Verlag.

Wicherts, I. S., A. J. P. Boeke, I. M. van der Meer, N. M. van Schoor, D. L. Knol, and P. Lips. Sunlight Exposure or Vitamin D Supplementation for Vitamin D-deficient Non-western Immigrants: A Randomized Clinical Trial. Springer-Verlag, 2010.

Wicherts, I. S., et al. Sunlight Exposure or Vitamin D Supplementation for Vitamin D-deficient Non-western Immigrants: A Randomized Clinical Trial. Springer-Verlag, 2010.