diff --git a/src/main/java/edu/unl/cse/soft160/library/App.java b/src/main/java/edu/unl/cse/soft160/library/App.java
index dc6065ffcbd767a7a07516f3f52b3c125a115fff..3a7ce68ede1fcbf571b8bf03a7d4511af5beff25 100644
--- a/src/main/java/edu/unl/cse/soft160/library/App.java
+++ b/src/main/java/edu/unl/cse/soft160/library/App.java
@@ -1,13 +1,13 @@
 package edu.unl.cse.soft160.library;
 
 public class App {
-        public static void main(String... arguments) {
-                Book book = new Book();
-                book.entry = "Frankenstein; or, the Modern Prometheus";
-                book.title = "Frankenstein";
-                book.subtitle = "or, the Modern Prometheus";
-                Library library = new Library();
-                library.add(book);
-                System.out.println(library);
-        }
+	public static void main(String... arguments) {
+		Book book = new Book();
+		book.entry = "Frankenstein; or, the Modern Prometheus";
+		book.title = "Frankenstein";
+		book.subtitle = "or, the Modern Prometheus";
+		Library library = new Library();
+		library.add(book);
+		System.out.println(library);
+	}
 }
diff --git a/src/main/java/edu/unl/cse/soft160/library/Book.java b/src/main/java/edu/unl/cse/soft160/library/Book.java
index b56a166c4a8c8c54b56ede291f488efb84a2602e..319f778c5ea6302910e57b4d15c1b60769f42d81 100644
--- a/src/main/java/edu/unl/cse/soft160/library/Book.java
+++ b/src/main/java/edu/unl/cse/soft160/library/Book.java
@@ -1,7 +1,7 @@
 package edu.unl.cse.soft160.library;
 
 public class Book {
-        public String entry;
-        public String title;
-        public String subtitle;
+	public String entry;
+	public String title;
+	public String subtitle;
 }
diff --git a/src/main/java/edu/unl/cse/soft160/library/Library.java b/src/main/java/edu/unl/cse/soft160/library/Library.java
index f0656443eec4a6c097c7fbb7407c90a00e210aba..63ceada6d655f0abdb91740d75c1140b9ced3368 100644
--- a/src/main/java/edu/unl/cse/soft160/library/Library.java
+++ b/src/main/java/edu/unl/cse/soft160/library/Library.java
@@ -4,21 +4,21 @@ import java.util.ArrayList;
 import java.util.List;
 
 public class Library {
-        private List<Book>books;
-        
-        public Library() {
-                books = new ArrayList<Book>();
-        }
-        
-        public void add(Book book) {
-                books.add(book);
-        }
-        
-        public void remove(Book book) {
-                books.remove(book);
-        }
-        
-        public String toString() {
-                return String.valueOf(books);
-        }
+	private List<Book> books;
+
+	public Library() {
+		books = new ArrayList<Book>();
+	}
+
+	public void add(Book book) {
+		books.add(book);
+	}
+
+	public void remove(Book book) {
+		books.remove(book);
+	}
+
+	public String toString() {
+		return String.valueOf(books);
+	}
 }