Verschuur, R., Kemper, H. C., Mey, L. d., Lucienne, S. E., Aalst, R. v., Zundert, A. v., . . . Simkin, A. (1987). Longitudinal development of physical fitness in girls and boys from age 12 to 22. The Amsterdam Growth and Health Study. Physical fitness and the ages of man, S. 33-58.

Verschuur, Robbert, Han C.G Kemper, Langa de Mey, Storm-van Essen Lucienne, Ronald van Aalst, Adrie van Zundert, Hillel Ruskin, and Ariel Simkin. "Longitudinal Development of Physical Fitness in Girls and Boys From Age 12 to 22. The Amsterdam Growth and Health Study." Physical Fitness and the Ages of Man 1987: S. 33-58.

Verschuur, Robbert, et al. "Longitudinal Development of Physical Fitness in Girls and Boys From Age 12 to 22. The Amsterdam Growth and Health Study." Physical Fitness and the Ages of Man 1987: S. 33-58.