Acts of Barnabas: Fifth-century work tells of Barnabas's journey to Cyprus and martyrdom at Salamis. From the Ante-Nicene Fathers (American edition), vol. 8. In HTML, with notes, at Christian Classics Ethereal Library.
Barnabas: Short biography, by Karen Rae Keck.
James Kiefer's Christian Biographies: Barnabas the Apostle: With prayer in traditional and contemporary language.
Patron Saints Index: Barnabas the Apostle: Illustrated profile.
Saint Barnabas, Apostle: Biographical portrait.
St. Barnabas: Originally called Joseph, missionary, called an Apostle.