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.
Lua i Stíl Chicago (17ú heag.)Barnes, William, agus 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.
Lua MLA (8ú heag.)Barnes, William, agus John Heath Morgan. The Foreign Service of the United States: Origins, Development and Functions. Historical Office, Bureau of Public Affairs, Dept. of State, 1961.
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