Please note the links require journal subscription access which may be available through your university.
Church, M, (2010) ‘The trajectory of geomorphology’, Progress in Physical Geography 34 (3): 265-86. doi: 10.1177/0309133310363992
Lake, R.W. (1993) ‘Planning and applied geography: positivism, ethics, and geographic information systems’, Progress in Human Geography 17 (3): 404-13. doi: 10.1177/030913259301700309.
Mather, P. (1979) ‘Theory and quantitative methods in geomorphology’, Progress in Physical Geography 3 (4): 471-487. [Note that the ‘realism’ described early in this paper is Bhaskar’s critical realism – see Chapter 4 – rather than scientific realism in general].
Schurman, N. (2000) ‘Trouble in the heartland: GIS and its critics in the 1990s’, Progress in Human Geography 24 (4): 569-90. doi: 10.1191/030913200100189111.
http://phg.sagepub.com/content/24/4/569.full.pdf+html
[The focus here is on GIS, but this includes some discussion of (debates about) positivism and GIS].
Smith, N. (1979) ‘Geography, science and post-positivist modes of explanation’, Progress in Human Geography 3 (3): 356-83. doi: 10.1177/030913257900300302.
http://phg.sagepub.com/content/3/3/356.full.pdf+html