1 files changed, 11 insertions, 0 deletions
diff --git a/physics.bib b/physics.bib
index c001713..bda137f 100755
--- a/physics.bib
+++ b/physics.bib
@@ -302,3 +302,14 @@
   edition   = {Reprint},
   volume    = {},
 }
+
+@book{helrich2021,
+  title     = {The Quantum Theory―Origins and Ideas: A Historical Primer for Physics Students},
+  author    = {Carl S. Helrich},
+  publisher = {Springer},
+  isbn      = {9783030792671,9783030792688},
+  year      = {2021},
+  series    = {History of Physics},
+  edition   = {1},
+  volume    = {},
+}