APA (7th ed.) Citation

Robertson, C., Rich, E. E., & Flemming, R. H. (1939). Colin Robertson's Correspondence book, September 1817 to September 1822. The Champlain society.

Chicago Style (17th ed.) Citation

Robertson, Colin, E. E. Rich, and R. Harvey Flemming. Colin Robertson's Correspondence Book, September 1817 to September 1822. Toronto: The Champlain society, 1939.

MLA (8th ed.) Citation

Robertson, Colin, et al. Colin Robertson's Correspondence Book, September 1817 to September 1822. The Champlain society, 1939.

Warning: These citations may not always be 100% accurate.