منتدى الفرح المسيحى - Many other examples could be cited

Roman Catholic Catechism

Page 9: Do we get from the Bible alone all our knowledge and certainty about what God has told us? No, there is also Sacred Tradition ... What is tradition? The Word of God handed on to us by the Apostles in their preaching and by their successors in the Church to the present day...
Page 51: Did God intend that the Bible alone should be the guide to salvation? No, because certain things in the Bible can be misunderstood, and because the Bible does not have everything God taught.
Page 56 - Does Jesus require us to follow the Pope in matters of religion? Yes, because obedience and loyalty to the Pope are among the chief requirements of Our Lord's plan for unity in His church - A Catechism for Adults, 1975 edition.

Many other examples could be cited. Sometimes members of these groups will affirm that they do not recognize these writings as authority. Nevertheless, the denomination they are a member of does recognize and follow them. These are human standards in addition to the Bible. Men wrote them and men can change them.