Update citations, close #986 (#987)

* Update citations, close #986 * Revert output changes * Fix typo
geocompx · Oct 24, 2023 · 2c8e9be · 2c8e9be
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diff --git a/02-spatial-data.Rmd b/02-spatial-data.Rmd
@@ -1120,7 +1120,7 @@ A planar projection projects data onto a flat surface touching the globe at a po
 It is typically used in mapping polar regions.
 `sf_proj_info(type = "proj")` gives a list of the available projections supported by the PROJ library.
 
-A quick summary of different projections, their types, properties, and suitability can be found in @_map_1993 and at https://www.geo-projections.com/.
+A quick summary of different projections, their types, properties, and suitability can be found at [www.geo-projections.com](https://www.geo-projections.com/).
 We will expand on CRSs and explain how to project from one CRS to another in Chapter \@ref(reproj-geo-data).
 For now, it is sufficient to know: