Is there any reference regarding the use of these extra-biblical sources in Mennonite congregations? Background

A few years ago, a concern was raised by a member of a local Mennonite congregation about the use of citations from the Shepherd of Hermas. At the time, the concern was alleviated when it was mentioned that the Mennonite council endorsed its use as a secondary text.

Recently, the concern was raised again. This time the member would like a citation or reference in order to substantiate either the endorsement, repudiation, or neutrality toward this text by Mennonite Bretheren.

Question

Does anyone have a cite or reference that discusses whether and to what extent the following extra-biblical sources are considered appropriate for teaching and instruction for Mennonite congregations?


Epistle of Barnabas, 
The Shepherd of Hermas
The First Epistle of Clement to the Corinthians, 


Any citation or reference either supporting or repudiating these texts from a Mennonite denomination or organization is requested.
Having been a Mennonite for all my adult life, and attending a Mennonite Brethren church for the last 8 years or so, I have never heard of The Shepherd of Hermas, or any of the other books you mentioned.

However, Mennonites, and many other denominations, often use written resources in sermons, corporate worship (recitations, hymns, songs), etc, that are extra-Biblical.

The official stand of the U.S. Mennonite Brethren Church on the use of such teachings is summed up in Article 2 of the Confession of Faith:


  The Holy Spirit continues to make God known to individuals and the church; this revelation is always consistent with the Scriptures.


According to this, any extra-Biblical teaching which claims to be revelation of God ought to be permitted, so long as it is consistent with the Scriptures.