@Override
	public boolean equals(Object obj) {
		if (obj == null) {
			return false;
		}
		if (obj == this) {
			return true;
		}
		if (obj.getClass() != getClass()) {
			return false;
		}
		Book otherAddressBook = (Book) obj;
		return new EqualsBuilder().append(label, otherAddressBook.label).isEquals();
	}