1.		El turismo en el plan de desarrollo economico-social / Ramón Hermida Autor: Hermida, Ramón Data Publicação: 1971 COTA(S): 6289
2.		The changing world of travel marketing : Vth International Travel Research Seminar - Nassau (Bahamas), June 1971 / IUOTO - International Union of Official Travel Organization Data Publicação: 1971 Col.autor: IUOTO. International Union of Official Travel Organization COTA(S): 22; 22-a