diff --git a/skimage/morphology/_skeletonize.py b/skimage/morphology/_skeletonize.py
index 1a15c3a6..0ea9cf7d 100644
--- a/skimage/morphology/_skeletonize.py
+++ b/skimage/morphology/_skeletonize.py
@@ -33,7 +33,7 @@ def skeletonize(image):
 
     Notes
     -----
-    The algorithm [1] works by making successive passes of the image,
+    The algorithm [1]_ works by making successive passes of the image,
     removing pixels on object borders. This continues until no
     more pixels can be removed.  The image is correlated with a
     mask that assigns each pixel a number in the range [0...255]
@@ -49,8 +49,8 @@ def skeletonize(image):
     References
     ----------
     .. [1] A fast parallel algorithm for thinning digital patterns,
-       T. Y. ZHANG and C. Y. SUEN, Communications of the ACM,
-       March 1984, Volume 27, Number 3
+           T. Y. Zhang and C. Y. Suen, Communications of the ACM,
+           March 1984, Volume 27, Number 3.
 
 
     Examples
diff --git a/skimage/morphology/_skeletonize_cy.pyx b/skimage/morphology/_skeletonize_cy.pyx
index 0ff419b3..54e90266 100644
--- a/skimage/morphology/_skeletonize_cy.pyx
+++ b/skimage/morphology/_skeletonize_cy.pyx
@@ -7,7 +7,7 @@ import numpy as np
 cimport numpy as cnp
 
 def _fast_skeletonize(image):
-    """Optimized parts of the Zhang-Suen [1] skeletonization.
+    """Optimized parts of the Zhang-Suen [1]_ skeletonization.
     Iteratively, pixels meeting removal criteria are removed,
     till only the skeleton remains (that is, no further removable pixel
     was found).
@@ -30,8 +30,8 @@ def _fast_skeletonize(image):
     References
     ----------
     .. [1] A fast parallel algorithm for thinning digital patterns,
-       T. Y. ZHANG and C. Y. SUEN, Communications of the ACM,
-       March 1984, Volume 27, Number 3
+           T. Y. Zhang and C. Y. Suen, Communications of the ACM,
+           March 1984, Volume 27, Number 3.
 
     """