Roberto De Visiani has written:
'Illustrazione delle piante nuove o rare dell'Orto botanico di Padova'
Roberto Aliaga has written: 'Poemitas de maiz'
Roberto de Pola has written: 'El libro de la cocina gallega'
Roberto Knop has written: 'Medicic'n de Riesgos de Mercado y Credito'
ROBERTO DE MATTEI has written: 'PIUX IX; TRANS. BY JOHN LAUGHLAND'
Roberto Mariani has written: 'Cuentos de la oficina'
Roberto Aparici Marino has written: 'Lectura de imagenes'
Roberto Bergalli has written: 'Politica Criminal de La Guerra'
Roberto Kozulj has written: 'Choque de Civilizaciones, O, Crisis de La Civilizacion Global?'
Roberto Palacios has written: 'Luis Brion, primer protector de America'
Roberto Armani has written: 'Trenel, un pueblo de La Pampa'
Roberto Eduardo Xavier has written: 'O pesadelo de Frau Keller'
Roberto G. Paterson has written: 'La ciudad absurda' 'La familia de Garcia'