Hebrews, James, 1st Peter, 2nd Peter, 1st John, 2nd John,3rd John, and Jude.
The book of Hebrews is a General Epistle (Apostolic Letter). It was written mainly to the Hebrew believers. The author is anonymous, although either Paul or Barnabas was traditionally accepted as the author.
James
1st Peter
2nd Peter
1st John
2nd John
The book of 2nd John is a General Epistle (Apostolic Letter). It is written by John around 85-95 A.D. It was written to encourage all Christians not to lose focus of Jesus Christ and to warn against persistent heresy. His key purpose is that his children (the children of God) may abide in the truth and the truth may abide in them.
3rd John
The book of 3rd John is a General Epistle (Apostolic Letter). It is written by John around 85-95 A.D. This book is the shortest book in the New Testament and was written to praise Gaius and Demetrius for their faithful service.
Jude
The author is Jude the brother of James, both of who are half-brothers of Jesus Christ. Jude wrote it circa 75 A.D. The purpose of this book is to address false teachings and to illustrate a contrast between the error of heresy and the truth of Jesus Christ. Jude consists of only one chapter.