Skillful : Listening & Speaking por: Baker, Lida | Clandfield, Lindsay | Gershon, Steven | Bohlke, David | Mckinnon, Mark | Rogers, Louis | Sharma, Pete Publicado: (2013)
NorthStar: Listening and Speaking por: Frazier, Laurie | Ferree, Tess | Sanabria, Kim | Mills, Robin | Preiss, Sherry | Schmidt, Jennifer P. L | Solorzano, Helen S Publicado: (2009)