Analysis of information sources in references of the Wikipedia article "John Tyrrell (died 1437)" in English language version.
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: CS1 maint: location missing publisher (link) Horrox, Rosemary (2004). "Tyrell family (per. c.1304–c.1510)". Oxford Dictionary of National Biography (online ed.). Oxford University Press. doi:10.1093/ref:odnb/52799. (Subscription or UK public library membership required.){{cite book}}
: CS1 maint: location missing publisher (link) Horrox, Rosemary (2004). "Tyrell family (per. c.1304–c.1510)". Oxford Dictionary of National Biography (online ed.). Oxford University Press. doi:10.1093/ref:odnb/52799. (Subscription or UK public library membership required.)