diff --git a/paper/paper.bib b/paper/paper.bib
index e69de29b..431b74d1 100644
--- a/paper/paper.bib
+++ b/paper/paper.bib
@@ -0,0 +1,11 @@
+@article{ObsPy2015,
+    title={ObsPy: a bridge for seismology into the scientific Python ecosystem},
+    author={Krischer, Lion and Megies, Tobias and Barsch, Robert and Beyreuther, Moritz and Lecocq, Thomas and Caudron, Corentin and Wassermann, Joachim},
+    journal={Computational Science & Discovery},
+    volume={8},
+    number={1},
+    pages={014003}
+    year={2015},
+    month=may,
+    DOI={10.1088/1749-4699/8/1/014003},
+}
diff --git a/paper/paper.md b/paper/paper.md
index 8e1f38eb..40216319 100644
--- a/paper/paper.md
+++ b/paper/paper.md
@@ -44,7 +44,7 @@ Once registered, users can authenticate their accounts within HinetPy to access
 download the data. The NIED Hi-net data is free-accessible after user registration.
 However, accessing Hi-net seismic data can still be challenging. Although the
 seismological community have switched to standard web services users can request data
-waveforms using tools like ObsPy. Unfortuately, NEID Hi-net has upgraded their server to
+waveforms using tools like ObsPy [@ObsPy2015]. Unfortuately, NEID Hi-net has upgraded their server to
 use the web services. Users have to login in the NIED Hi-net website and request data
 manually. What’s more challenging are the limitations about data size and length in one
 single request: the number of channels \* record length must be no larger than 12000
@@ -78,7 +78,12 @@ but there are no tools to convert the channels table to a more commonly used for
 
 # HinetPy for easy data accessing and processing
 
-HinetPy is a Python package developed to address the challenges of accessing and processing NIED Hi-net data. The package provides a simple and intuitive interface for accessing Hi-net data, allowing researchers to easily download waveform data and station metadata. HinetPy also includes tools for processing seismic data, mainly converting the seismic data from win32 format to SAC format and build SAC polezero files from the channels table.
+HinetPy is a Python package developed to address the challenges of accessing and
+processing NIED Hi-net data. The package provides a simple and intuitive interface for
+accessing Hi-net data, allowing researchers to easily download waveform data and station
+metadata. HinetPy also includes tools for processing seismic data, mainly converting the
+seismic data from win32 format to SAC format and build SAC polezero files from the
+channels table.
 
 Here is an example showing how to access and process NIED Hi-net waveform data.