diff --git a/exercises/debugging-strategies.qmd b/exercises/debugging-strategies.qmd
index 0b62253b8997a46650234ac4dcd71a5785e71723..f6f05b036dd195e164c820417cbc967c8517bafb 100644
--- a/exercises/debugging-strategies.qmd
+++ b/exercises/debugging-strategies.qmd
@@ -5,12 +5,12 @@ title: "Debugging strategies"
 ### 1. Approach on locating Python bugs
 
 _The tasks should be done using the test repository <https://github.com/gweis/isodate>,
-specifically commit 8856fdf0 (HEAD of `master` branch at the moment of writing this)._
+specifically version `v0.6.1` (commit `4f36d7e6f`)._
 
 _It is a Python library to parse date and times according to the ISO 8601 standard.
-Although it works great in many use cases, there are some documented bugs in the code.
+Although it works great in many use cases, there are some documented bugs in the code for former versions.
 But the linked repository was not chosen to cast a bad light on it in any way.
-In fact, it does a good job providing tests and stating which problems still occur in the code._
+In fact, it does a good job providing tests and stating which problems occured in the code._
 
 **Tasks**
 
diff --git a/lectures/debugging-strategies/slides.qmd b/lectures/debugging-strategies/slides.qmd
index ada31330097fcf7f4a113042004e6ee78f476fbd..23a2696438ce22d0cad3b60ffc2a417e3a918d90 100644
--- a/lectures/debugging-strategies/slides.qmd
+++ b/lectures/debugging-strategies/slides.qmd
@@ -438,7 +438,7 @@ In the Fortran world, also
 
 Try with more than just one compiler
 
-$\Rightarrow$ HPC systems usally provide native compiler plus gcc/gfortan. Try both variants.
+$\Rightarrow$ HPC systems usually provide native compiler plus gcc/gfortan. Try both variants.
 
 
 
@@ -878,3 +878,6 @@ end program loop_count_2d
 ::::::::
 
 
+# Further reading
+
+Topic 20 (in ch 3) of *The pragmatic programmer* [UHH Library system](https://katalogplus.sub.uni-hamburg.de/vufind/Record/168729271X) | [MPS ebooks](https://ebooks.mpdl.mpg.de/ebooks/Record/EB001950880) | [German ebook via UHH](https://katalogplus.sub.uni-hamburg.de/vufind/Record/1755846843)