Updated the missing APL books (#3495)

* Updated the missing APL books * Removed the trailing slash

Updated the missing APL books (#3495)
* Updated the missing APL books * Removed the trailing slash
68161a14 · Timo Salomäki · Eric Hellman · 99194f80 · 68161a14
隐藏空白更改
内联并排

Showing with 2 addition and 2 deletion

free-programming-books.md free-programming-books.md +2 -2

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--- a/free-programming-books.md
+++ b/free-programming-books.md
@@ -841,8 +841,8 @@ Kerridge (PDF) (email address *requested*, not required)

 ### APL

-* [A Practical Introduction to APL1 & APL2](http://aplwiki.com/BooksAndPublications#A_Practical_Introduction_to_APL1_.26_APL2)
-* [A Practical Introduction to APL3 & APL4](http://aplwiki.com/BooksAndPublications#A_Practical_Introduction_to_APL3_.26_APL4)
+* [A Practical Introduction to APL1 & APL2](http://robertson.uk.net) - Graeme Donald Robertson (PDF)
+* [A Practical Introduction to APL3 & APL4](http://robertson.uk.net) - Graeme Donald Robertson (PDF)
 * [Mastering Dyalog APL](http://www.dyalog.com/mastering-dyalog-apl.htm) (PDF)