Introduction to Obadiah From the New American Bible

Obadiah, Book of By Emil G. Hirsch and George A. Barton, The Jewish Encyclopedia, 1910

Ovadiah - Chapter 1 The text of Obadiah with the commentary by the 11th century rabbi Rashi

Obadiah By Church of Christ Minister Al Maxey

Obadiah iTanakh's collection of links, courtesy of R. Christopher Heard of Milligan College

Beginning the Second Wave of Prophecy: Zephaniah, Nahum, Habakkuk and Obadiah By John W. Miller. They struggled to reconcile the words of "First Wave" prophets like Amos and Isaiah to the crises of the following century