Walker, M. (1963). The Nature of Scientific Thought. Englewood Cliffs, New Jersey: Prentice-Hall.
Čikaški stil citiranjaWalker, Marshall. The Nature of Scientific Thought. Englewood Cliffs, New Jersey: Prentice-Hall, 1963.
MLA način citiranjaWalker, Marshall. The Nature of Scientific Thought. Englewood Cliffs, New Jersey: Prentice-Hall, 1963.
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