Bd. 1. A - C. 1821
https://books.google.com/books?id=eG9IAAAAMAAJ
https://books.google.com/books?id=ifHvGjMIEvwC
https://books.google.com/books?id=rZdGAQAAMAAJ
https://archive.org/details/biographiahiber01ryangoog
https://archive.org/details/biographiahiber02ryangoog
http://hdl.handle.net/2027/mdp.39015065997085
http://hdl.handle.net/2027/nyp.33433067285290
http://hdl.handle.net/2027/uc1.$b212187
Bd. 2. 1821
https://books.google.com/books?id=R5-iiRG14gYC
https://books.google.com/books?id=JowxAQAAIAAJ
https://books.google.com/books?id=sZFIAAAAMAAJ
https://archive.org/details/biographiahiber00ryangoog
http://hdl.handle.net/2027/uc1.$b756713
https://books.google.com/books?id=rZdGAQAAMAAJ&pg=PA491
http://hdl.handle.net/2027/mdp.39015065997077
http://hdl.handle.net/2027/nyp.33433067285308
http://hdl.handle.net/2027/uc1.$b212187?urlappend=%3Bseq=507
Bd. 1. 1821
https://books.google.com/books?id=eG9IAAAAMAAJ&pg=PA487
https://archive.org/stream/biographiahiber01ryangoog#page/n498
http://hdl.handle.net/2027/mdp.39015065997085?urlappend=%3Bseq=501
Bd. 2. 1821
https://books.google.com/books?id=R5-iiRG14gYC&pg=PA650
https://archive.org/stream/biographiahiber00ryangoog#page/n678
http://hdl.handle.net/2027/mdp.39015065997077?urlappend=%3Bseq=662
Wikipedia, engl.
https://en.wikipedia.org/wiki/Richard_Ryan_%28biographer%29
Dictionary of National Biography 50 (1897), S. 37-38
https://books.google.com/books?id=2topAAAAYAAJ&pg=PA37
https://en.wikisource.org/wiki/Ryan,_Richard_%28DNB00%29
Webb, A.: A compendium of irish biography. Dublin 1878, S. 461
https://archive.org/stream/compendiumofiris00webb#page/460/mode/2up
http://www.libraryireland.com/biography/RichardRyan.php