Krombholz, H. (1986). Results in regard to the International standard fitness test <ISFT>. Reliability and norms for primary school children. International journal of physical education, 23(4), S. 8-17.

Krombholz, Heinz. "Results in Regard to the International Standard Fitness Test . Reliability and Norms for Primary School Children." International Journal of Physical Education 23, no. 4 (1986): S. 8-17.

Krombholz, Heinz. "Results in Regard to the International Standard Fitness Test . Reliability and Norms for Primary School Children." International Journal of Physical Education 23.4 (1986): S. 8-17.