A. B. C. D. E. F. G. H. I. J. K. L. M. N .O. P. Q. R. S. T. U. V. W. X. Y. Z
'Knowledge is of two kinds.
We know a
or we know where we can find information upon it.'
(Samuel Johnson, 1709-1784)
Primary sources of information allow the learner to access original and unedited information. A primary source requires the learner to interact with the source and extract information. Secondary sources are edited primary sources, second-hand versions. They represent someone else's thinking.