Butterfiel, W. (1964). Effective personal letters (2nd rev.). Prentice Hall.
Chicago-čujuhus (17. p.)Butterfiel, W. Effective Personal Letters. 2nd rev. Englewood Cliffs: Prentice Hall, 1964.
MLA-čujuhus (9. p.)Butterfiel, W. Effective Personal Letters. 2nd rev. Prentice Hall, 1964.
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