Barber, J. D. (1992). The presidential character: Predicting performance in the White House (4th ed.). Prentice Hall.
Chicago-viite (17. p.)Barber, James David. The Presidential Character: Predicting Performance in the White House. 4th ed. Englewood Cliffs, N.J: Prentice Hall, 1992.
MLA-viite (9. p.)Barber, James David. The Presidential Character: Predicting Performance in the White House. 4th ed. Prentice Hall, 1992.
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