Bibliography:

• James Dunlop, 1828. A Catalogue of Nebulae and Clusters of Stars in the Southern Hemisphere observed in New South Wales. Philosophical Transactions of the Royal Society, Vol. 118, p. 113-151

• James Dunlop images, NGC/IC observers page
• Some James Dunlop info, Yann Pothier
• Glen Cozens and Graeme L. White, 2001. James Dunlop: Messier of the Southern Sky. Sky & Telescope, Vol. 101, No. 6 (June 2001), p. 112-116.