diff --git a/curriculum/challenges/english/17-college-algebra-with-python/learn-applications-of-linear-systems/word-problems.md b/curriculum/challenges/english/17-college-algebra-with-python/learn-applications-of-linear-systems/word-problems.md
index fa8f960b120..3772e78d60a 100644
--- a/curriculum/challenges/english/17-college-algebra-with-python/learn-applications-of-linear-systems/word-problems.md
+++ b/curriculum/challenges/english/17-college-algebra-with-python/learn-applications-of-linear-systems/word-problems.md
@@ -14,7 +14,9 @@ This first video will look at key words that tell you what math operation to use
\- Business Math, a Step-by-Step Handbook (2021) by Jean-Paul Oliver
-\- Algebra and Trigonometry by Jay Abramson
+\- Algebra and Trigonometry by Jay Abramson - sourced from OpenStax under Creative Commons Attribution 4.0 International (CC BY 4.0)
+
+It is also possible to download the Algebra and Trigonometry textbook from the OpenStax website. You will need to find the correct textbook and then download the PDF. The page numbers for the assignment are based on the first link for this book.
# --assignment--
diff --git a/curriculum/challenges/english/17-college-algebra-with-python/learn-ratios-and-proportions/introduction-to-college-algebra-with-python.md b/curriculum/challenges/english/17-college-algebra-with-python/learn-ratios-and-proportions/introduction-to-college-algebra-with-python.md
index c0bd01e06b4..0f5cadbead2 100644
--- a/curriculum/challenges/english/17-college-algebra-with-python/learn-ratios-and-proportions/introduction-to-college-algebra-with-python.md
+++ b/curriculum/challenges/english/17-college-algebra-with-python/learn-ratios-and-proportions/introduction-to-college-algebra-with-python.md
@@ -14,7 +14,9 @@ This first video includes an introduction to the course, how it will work, and h
\- Business Math, a Step-by-Step Handbook (2021) by Jean-Paul Oliver
-\- Algebra and Trigonometry by Jay Abramson
+\- Algebra and Trigonometry by Jay Abramson - sourced from OpenStax under Creative Commons Attribution 4.0 International (CC BY 4.0)
+
+It is also possible to download the Algebra and Trigonometry textbook from the OpenStax website. You will need to find the correct textbook and then download the PDF. The page numbers for the assignment are based on the first link for this book.
# --assignment--