The Minor Prophets: Haggai
- Historical and spiritual overview of the Biblical prophet.
- http://www.zianet.com/maxey/Proph9.htm

Haggai
- Profile of the prophet from a joint Lutheran and Catholic bible study project.
- http://www.aboutbibleprophecy.com/p18.htm

Book of Chaggai
- The text of the Biblical chapters in Hebrew and English.
- http://www.hareidi.org/bible/Haggai.htm

Catholic Encyclopedia: Aggeus (Haggai)
- Commentary on the Biblical prophet from the traditional Catholic perspective.
- http://www.newadvent.org/cathen/01209d.htm

Jewish Encyclopedia: Haggai
- Overview of the prophet from the traditional Jewish perspective, including rabbinic commentary.
- http://www.jewishencyclopedia.com/view.jsp?artid=63&letter=H