Sayre, W. S. (1965). The Federal Government service. Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)Sayre, Wallace Stanley. The Federal Government Service. Englewood Cliffs, N.J: Prentice-Hall, 1965.
Lua MLA (9ú heag.)Sayre, Wallace Stanley. The Federal Government Service. Prentice-Hall, 1965.
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