Lihat Juga

• Northstar: listening and speaking high intermediate achievement tests CD
  oleh: Sanabria, Kim, et al.
  Terbitan: (2004)
• Northstar: listening and speaking high intermediate DVD
  oleh: Sanabria, Kim, et al.
  Terbitan: (2004)
• Northstar: listening and speaking, high intermediate audio CDs
  oleh: Sanabria, Kim, et al.
  Terbitan: (2004)
• Northstar : listening and speaking, intermediate, teachers manual and achievement tests
  oleh: Solorzano, Helen S., et al.
  Terbitan: (2004)
• Northstar : listening and speaking, basic/low intermediate, teachers manual and achievement tests
  oleh: Mills, Robin, et al.
  Terbitan: (2004)