The list is from the work of Dr. Ludwig Ott, Fundamentals of Catholic Dogma, published by the Mercier Press Ltd., Cork, Ireland, 1955. With Imprimatur of Cornelius, Bishop. Reprinted in U.S.A. by Tan Books and Publishers, Rockford, Illinois, 1974.
As far as who the author of the general website is, I don't know. The website itself does not look traditional. :furtive:
Anyway, I thought it was a good list of Catholic dogmas. I didn't see any error in it, but then again I'm not an expert so if there is a mistake or contradiction in it, please point it out!