@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result + ((ativo == null) ? 0 : ativo.hashCode());
		result = prime * result + ((autores == null) ? 0 : autores.hashCode());
		result = prime * result + ((id == null) ? 0 : id.hashCode());
		result = prime * result + ((isbn == null) ? 0 : isbn.hashCode());
		result = prime * result + ((nome == null) ? 0 : nome.hashCode());
		return result;
	}