Freedman, Paul
The principles of scientific research
Public Affairs Press, 1950
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Hillway, Tyrus
Introduction to research
Houghton Miffiln, 1964
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Wilson, E. Bright
An Introduction to scientific research
McGraw-Hill, 1952
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Haring, Lloyd
Introduction to scientific geographic research / Lloyd Haring, John F. Lounsbury
Wm. C. Brown Co. Pub., 1983
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Fortune
The Mighty force of research/Fortune
McGraw-Hill, 1956
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