diff --git a/main.cpp b/main.cpp
index e48fc44afca9caa92a9b15137c3c0193e97188fc..1c47e8820aff802f092261267bdc146d3d6222c0 100644
--- a/main.cpp
+++ b/main.cpp
@@ -5,6 +5,7 @@
 
 #include "./sources/Biblioteca.hpp"
 #include "./sources/Livro.hpp"
+#include "./sources/Periodico.hpp"
 
 using namespace std;
 
diff --git a/sources/DescricaoObra.hpp b/sources/DescricaoObra.hpp
index 7e839f07425c923198ce5e104bd3a9c0dd7d24b7..a58d412a563dcc6121d04b4826006b0f9c837b62 100644
--- a/sources/DescricaoObra.hpp
+++ b/sources/DescricaoObra.hpp
@@ -17,7 +17,7 @@ class DescricaoObra {
     // Contructor
     DescricaoObra() {};
     DescricaoObra(const string& tipo, const string& titulo, int ano);
-    virtual void mostrarDetalhes() const;
+    virtual void mostrarDetalhes() const = 0;
 
     // Methods
     string getTitulo() const ;