Barnes, W., & Morgan, J. H. (1961). The Foreign Service of the United States: Origins, development and functions. Historical Office, Bureau of Public Affairs, Dept. of State.

Barnes, William, and John Heath Morgan. The Foreign Service of the United States: Origins, Development and Functions. [Washington: Historical Office, Bureau of Public Affairs, Dept. of State, 1961.

Barnes, William, and John Heath Morgan. The Foreign Service of the United States: Origins, Development and Functions. Historical Office, Bureau of Public Affairs, Dept. of State, 1961.