Derbyshire, J. D., & Derbyshire, I. (1989). Chambers political systems of the world. Chambers.
Chicago-čujuhus (17. p.)Derbyshire, J. Denis, juo Ian Derbyshire. Chambers Political Systems of the World. Edinburgh: Chambers, 1989.
MLA-čujuhus (9. p.)Derbyshire, J. Denis, juo Ian Derbyshire. Chambers Political Systems of the World. Chambers, 1989.
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