diff --git a/skimage/exposure/unwrap.py b/skimage/exposure/unwrap.py
index 04e7d9c6..a80c02f3 100644
--- a/skimage/exposure/unwrap.py
+++ b/skimage/exposure/unwrap.py
@@ -32,7 +32,7 @@ def unwrap(image, wrap_around=False):
     .. [1] Miguel Arevallilo Herraez, David R. Burton, Michael J. Lalor,
            and Munther A. Gdeisat, "Fast two-dimensional phase-unwrapping
            algorithm based on sorting by reliability following a noncontinuous
-           path", Journal Applied Optics, Vol. 41, No. 35, pp. 7437, 2002
+           path", Journal Applied Optics, Vol. 41, No. 35 (2002) 7437,
     .. [2] Abdul-Rahman, H., Gdeisat, M., Burton, D., & Lalor, M., "Fast
            three-dimensional phase-unwrapping algorithm based on sorting by
            reliability following a non-continuous path. In W. Osten,