Acar reference

Signed-off-by: Jim Pryor <profjim@jimpryor.net>

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@@ -146,7 +146,8 @@ Baby monads
 Booleans, Church numbers, and Church lists in OCaml
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-These questions adapted from web materials written by some smart dude named Acar.
+(These questions adapted from web materials by Umut Acar. See <http://www.mpi-sws.org/~umut/>.)
+
 The idea is to get booleans, Church numbers, "Church" lists, and
 binary trees working in OCaml.