Update README.markdown

Author: Christian Encarnacion

README.markdown

@@ -72,9 +72,9 @@ Fast sorts:
 
 Special-purpose sorts:
 
-- Bucket Sort
-- [Counting Sort](Counting-Sort/) :construction:
-- [Radix Sort](Radix-Sort/) :construction:
+- [Bucket Sort](Bucket Sort/) :construction:
+- [Counting Sort](Counting Sort/)
+- Radix Sort
 - [Topological Sort](Topological Sort/)
 
 Bad sorting algorithms (don't use these!):
@@ -143,14 +143,14 @@ Most of the time using just the built-in `Array`, `Dictionary`, and `Set` types
 - [Binary Tree](Binary Tree/). A tree where each node has at most two children.
 - [Binary Search Tree (BST)](Binary Search Tree/). A binary tree that orders its nodes in a way that allows for fast queries.
 - [AVL Tree](AVL Tree/). A binary search tree that balances itself using rotations. :construction:
-- [Red-Black Tree](Red Black Trees/) :construction:
+- Red-Black Tree
 - Splay Tree
-- [Threaded Binary Tree](Threaded\ Binary\ Tree/) :construction:
+- Threaded Binary Tree
 - [Segment Tree](Segment Tree/). Can quickly compute a function over a portion of an array.
 - kd-Tree
 - [Heap](Heap/). A binary tree stored in an array, so it doesn't use pointers. Makes a great priority queue.
 - Fibonacci Heap
-- [Trie](Trie/) :construction:
+- Trie
 - [B-Tree](B Tree/) :construction:
 
 ### Hashing
@@ -163,7 +163,7 @@ Most of the time using just the built-in `Array`, `Dictionary`, and `Set` types
 - [Bloom Filter](Bloom Filter/). A constant-memory data structure that probabilistically tests whether an element is in a set.
 - [Hash Set](Hash Set/). A set implemented using a hash table.
 - Multiset
-- Ordered Set
+- [Ordered Set](Ordered Set/). A set where the order of items matters.
 
 ### Graphs
 
@@ -197,6 +197,7 @@ The following books are available for free online:
 - [Algorithms, Etc.](http://jeffe.cs.illinois.edu/teaching/algorithms/) by Erickson
 - [Algorithms + Data Structures = Programs](http://www.ethoberon.ethz.ch/WirthPubl/AD.pdf) by Wirth
 - Algorithms and Data Structures: The Basic Toolbox by Mehlhorn and Sanders
+- [Wikibooks: Algorithms and Implementations](https://en.wikibooks.org/wiki/Algorithm_Implementation)
 
 Other algorithm repositories: