diff --git a/books/free-programming-books-langs.md b/books/free-programming-books-langs.md
index 76e31ad23135f..c82f81dd8aa54 100644
--- a/books/free-programming-books-langs.md
+++ b/books/free-programming-books-langs.md
@@ -280,7 +280,8 @@ Books on general-purpose programming that don't focus on a specific language are
 
 * [A Programming Language](https://softwarepreservation.computerhistory.org/apl/book/APROGRAMMINGLANGUAGE.pdf) - Kenneth E. Iverson (PDF)
 * [APL2 at a glance](https://ia801009.us.archive.org/28/items/apl-2-at-a-glance-brown-pakin-polivka/APL2_at_a_Glance_-_Brown_Pakin_Polivka.pdf) - James A. Brown, Sandra Pakin, Raymond P. Polivka - 1988 (PDF)
-* [Learning APL](https://xpqz.github.io/learnapl) - Stefan Kruger (HTML,PDF,IPYNB)
+* [Introduction to College Mathematics with A Programming Language (1978)](https://softwarepreservation.computerhistory.org/apl/book/CollegeMathematicswithAPL.pdf) - E. J. LeCuyer (PDF)
+* [Learning APL](https://xpqz.github.io/learnapl) - Stefan Kruger (HTML, PDF, IPYNB)
 * [Mastering Dyalog APL](https://www.dyalog.com/mastering-dyalog-apl.htm) (PDF, HTML, IPYNB) *( :construction: in process)*
 * [Reinforcement Learning From The Ground Up](https://romilly.github.io/o-x-o) - Romilly Cocking (PDF, HTML, IPYNB) *( :construction: in process)*