Name	Info	Provider	Link
Full text from	free resource	CORE	https://core.ac.uk/reader/10652735?utm_source=linkout
Full text from	free resource	K-State Research Exchange	https://krex.k-state.edu/dspace/bitstream/handle/2097/14860/Comprehensive%20multi-level%20-%20publisher%27s%20PDF.pdf?sequence=1&isAllowed=y
	subscription/membership/fee required	Sheridan PubFactory	https://journals.humankinetics.com/doi/10.1123/jpah.8.s1.s135