Update tobler citation (geocompx#911)

darrellcarvalho · Feb 24, 2023 · 2f0d9d6 · 2f0d9d6
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diff --git a/13-transport.Rmd b/13-transport.Rmd
@@ -25,7 +25,7 @@ library(sfnetworks)   # spatial network classes and functions
 ## Introduction
 
 In few other sectors is geographic space more tangible than transportation.
-The effort of moving (overcoming distance) is central to the 'first law' of geography, defined by Waldo Tobler in 1970 as follows [@miller_tobler_2004]:
+The effort of moving (overcoming distance) is central to the 'first law' of geography, defined by Waldo Tobler in 1970 as follows [@tobler_computer_1970]:
 
 > Everything is related to everything else, but near things are more related than distant things.
 

diff --git a/geocompr.bib b/geocompr.bib
@@ -2393,3 +2393,11 @@ @book{zuur_mixed_2009
   keywords = {\#nosource}
 }
 
+@article{tobler_computer_1970,
+  title = {A Computer Movie Simulating Urban Growth in the {{Detroit}} Region},
+  author = {Tobler, Waldo R},
+  date = {1970},
+  journaltitle = {Economic geography},
+  pages = {234--240},
+  issn = {0013-0095}
+}