diff --git a/adv_lab.bib b/adv_lab.bib
index 5c7bee5..1983b7b 100644
--- a/adv_lab.bib
+++ b/adv_lab.bib
@@ -1,3 +1,11 @@
+@misc { Xraybinary,
+      author = "Ian Ridpath",
+      title = "X-ray binary",
+      publisher = "Oxford University Press",
+      isbn = "9780199609055",
+      url = "//www.oxfordreference.com/10.1093/acref/9780199609055.001.0001/acref-9780199609055-e-4032"
+}
+
 @article{doi:10.1111/j.1365-2966.2005.08886.x,
   author = {Uttley, P. and McHardy, I. M. and Vaughan, S.},
   title = {Non-linear X-ray variability in X-ray binaries and active galaxies},
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