Forbes, J., & Stewart, I. (1927). Letters of General John Forbes relating to the expedition agains Fort Duquesne in 1758: Compiled from books in the Carnegie Library of Pittsburgh for the Allegheny County Committee, Pennsylvania Society of the Colonial Dames of America. Pittsburgh: Allegheny County Committee.

Forbes, John, and Irene Stewart. Letters of General John Forbes Relating to the Expedition Agains Fort Duquesne in 1758: Compiled From Books in the Carnegie Library of Pittsburgh for the Allegheny County Committee, Pennsylvania Society of the Colonial Dames of America. Pittsburgh: Allegheny County Committee, 1927.

Forbes, John, and Irene Stewart. Letters of General John Forbes Relating to the Expedition Agains Fort Duquesne in 1758: Compiled From Books in the Carnegie Library of Pittsburgh for the Allegheny County Committee, Pennsylvania Society of the Colonial Dames of America. Pittsburgh: Allegheny County Committee, 1927.