Mundo unido is an intermediate spanish series consisting of a grammar review text, a literary and cultural reader, and a workbook/lab manual accompanied by an audio program. The reader is thematically and lexically tied to the grammar book. It features both short and long, cultural and literary selections that focus on Hispanic life in the 90's.

Segunda Vuelta is an intermediate spanish series consisting of a grammar review text, a literary and cultural reader, and a wookbook/lab manual accompanied by audio program, the literary and cultural reader contains authentic readings and will be used as the reading component of the series when used in its entirety.

Robert L. Nicholas is the author of Mundo unido, Lectura y escritura: Nivel Intermedio, published by Wiley.