The writers were not inspired or guided by the Holy Spirit

[Mary Naeem]

Other Standards Came from Men.

They are human in origin. The writers were not inspired or guided by the Holy Spirit. Generally they do not even claim such. Nevertheless, denominations recognize these writings as authority - rule or law - which the group uses in determining what it should or should not teach and practice.
Examples

Methodist Discipline, p. v:

Traditionally United Methodists have not only been happy to be guided by the Discipline as a book of church law, but they have also usually regarded it with a certain degree of reverence... -- 1973 edition

Nazarene Manual, p. 27:

...we, the ministers and lay members of the Church of the Nazarene ... do hereby ordain, adopt, and set forth as the fundamental law or constitution of the Church of the Nazarene the Articles of Faith, the General Rules, and the Articles of Organization and Government here following... - 1972 Edition.

Page 44 tells how this Constitution may be repealed or amended by 2/3 vote.

Presbyterian Book Of Confessions, section 9.04:

The United Presbyterian Church ... is guided by the Nicene and Apostles' Creeds from the time of the early church; the Scots Confession, the Heidelberg Catechism, and the Second Helvetic Confession from the era of the Reformation; the Westminster Confession and Shorter Catechism from the seventeenth century; and the Theological Declaration of Barmen from the twentieth century" - 1967 edition

Note that they claim these creeds are founded on the Old and New Testaments; but they are not the Old and New Testaments - they are man-made creeds in addition to the Bible