BungeW.1966: Theoretical geography, second edition. Lund Studies in Geography, Series C, General and Mathematical Geography 1, Lund: Gleerup.
2.
BurtonI.1963: The quantitative revolution and theoretical geography. The Canadian Geographer7, 151–62.
3.
DrayW.1957: Laws and explanation in history. Oxford: Oxford University Press.
4.
editor, 1966: Philosophical analysis and history. New York: Harper and Row.
5.
GouldP.1969: Spatial diffusion. Commision on College Geography, Resource Paper No. 4. Washington, DC: Association of American Geographers.
6.
GuelkeL.1971: Problems of scientific explanation in geography. The Canadian Geographer15, 38–53.
7.
HartshorneR.1939: The nature of geography. Lancaster, Pennsylvania: Association of American Geographers.
8.
1959: Perspective on the nature of geography. Chicago: Rand McNally and Co. for the Association of American Geographers.
9.
HarveyD.1969: Explanation in geography. London: Edward Arnold.
10.
HempelC. G.1942: The function of general laws in history. In HempelC. G., editor, 1965, Aspects of scientific explanation, New York: The Free Press.
11.
HempelC. G.OppenheimP.1948: Studies in the logic of explanation. In HempelC. G., editor, 1965, Aspects of scientific explanation, New York: The Free Press.
12.
HookS., editor, 1963: Philosophy and history. New York: New York University Press.
13.
McCartyH. H.SalisburyN. E.1961: Visual comparisons of isopleth maps as a means of determining correlations between spatially distributed phenomena. Des Moines: University of Iowa, Department of Geography.
14.
MinkL. O.1966: The autonomy of historical understanding. In DrayW., editor, 1966.
15.
NashD. H., editor, 1969: Ideas of history 2: The critical philosophy of history. New York: E. P. Dutton and Co., Inc.
16.
SchaeferF. K.1953: Exceptionalism in geography: a methodological examination. Annals of the Association of American Geographers43, 226–49.