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diff --git a/doc/source/reference/index.rst b/doc/source/reference/index.rst
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@@ -31,8 +31,8 @@ Acknowledgements
================
Large parts of this manual originate from Travis E. Oliphant's book
-`Guide to NumPy <http://www.tramy.us/>`__ (which generously entered
-Public Domain in August 2008). The reference documentation for many of
+`Guide to NumPy <https://archive.org/details/NumPyBook>`__ (which generously
+entered Public Domain in August 2008). The reference documentation for many of
the functions are written by numerous contributors and developers of
NumPy, both prior to and during the
`NumPy Documentation Marathon