The Y Balance Test™ was developed to refine the lengthy process of conducting the Star Excursion Balance Test. As such, most of the supportive research for the Y Balance Test™ is based on the investigations conducted on the Star Excursion Balance Test. Nevertheless, the Y Balance Test™ has not only proven itself to have a high-level of test–retest reliability, but also to be a sensitive indicator of injury risk amongst athletes.
When refering to evidence in academic writing, you should always try to reference the primary (original) source. That is usually the journal article where the information was first stated. In most cases Physiopedia articles are a secondary source and so should not be used as references. Physiopedia articles are best used to find the original sources of information (see the references list at the bottom of the article).