Athletic supporters are fiercely proud of the policy, but some club members are asking whether the interpretation of it should be extended
Athletic Bilbao: Two cup finals in a fortnight and one unique philosophy
Athletic Bilbao's Basque-only 'philosophy' – and why some are
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Barcelona vs Athletic Bilbao, La Liga: Final Score 1-0, 17-year
Barcelona vs Athletic Bilbao, La Liga: Final Score 1-0, 17-year
Barcelona vs Athletic Bilbao, La Liga: Final Score 1-0, 17-year
Inside Athletic Bilbao: the football club playing by their own
Inaki Williams' African roots thriving at Athletic Bilbao and Spain's Basque region
What are the arguments in favor of getting rid of Athletic Bilbao's philosophy of only using Basque players? - Quora
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Mikel San José: Meet the former Liverpool youngster who came good at Athletic Bilbao, Football News
Philosophy and Values of the Athletic Bilbao footbal team