Mayer, Robert R.
Policy and program planning / Robert R. Mayer
Prentice-Hall, 1985
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Goode, William J.
Methods in social research
McGraw-Hill, 1952
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Galtung, Johan
Theory and methods of social research
George Allen and Unwin, 1969
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Blalock, Hubert M.
An introduction to social research
Prentice-Hall, 1982
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Blalock, Hubert M.
An introduction to social research
Prentice-Hall, 1970
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