Whitford D., Esterman A. (2007). «A randomized controlled trial of two types of in-shoe orthoses in children with flexible excess pronation of the feet». Foot and Ankle International (University of South Australia, Spencer Gulf Rural Health School) 28 (6): 715-723. PMID17592702. doi:10.3113/FAI.2007.0715.
Whitford D., Esterman A. (2007). «A randomized controlled trial of two types of in-shoe orthoses in children with flexible excess pronation of the feet». Foot and Ankle International (University of South Australia, Spencer Gulf Rural Health School) 28 (6): 715-723. PMID17592702. doi:10.3113/FAI.2007.0715.