Fix wrong reference on irradiance.reindl

Author: cbcrespo

pvlib/irradiance.py

@@ -948,10 +948,12 @@ def reindl(surface_tilt, surface_azimuth, dhi, dni, ghi, dni_extra,
 
     References
     ----------
-    .. [1] Reindl, D. T., Beckmann, W. A., Duffie, J. A., 1990a. Diffuse
-       fraction correlations. Solar Energy 45(1), 1-7.
-       :doi:`10.1016/0038-092X(90)90060-P`
-    .. [2] Reindl, D. T., Beckmann, W. A., Duffie, J. A., 1990b. Evaluation of
+    .. [1] Reindl, D. T., 1988. Estimating diffuse radiation on horizontal
+       surfaces and total radiation on tilted surfaces. M.Sc. thesis,
+       University of Wisconsin-Madison. Available from:
+       https://web.archive.org/web/20240709013622/https://minds.wisconsin.edu/bitstream/handle/1793/47852/0001.pdf
+       (Last accessed: 09/06/26)
+    .. [2] Reindl, D. T., Beckmann, W. A., Duffie, J. A., 1990. Evaluation of
        hourly tilted surface radiation models. Solar Energy 45(1), 9-17.
        :doi:`10.1016/0038-092X(90)90061-G`
     .. [3] Loutzenhiser P. G. et. al., 2007. Empirical validation of models to