Dellar H., Walkley A. — 2nd edition. — National Geographic Learning, a part of Cengage Learning, 2017. Audio: Tracks 1-58. Video: Clips 1-40, National Geographic and conversation practice videos
Dellar H., Walkley A. — 2nd edition. — National Geographic Learning, a part of Cengage Learning, 2017. Audio: Tracks 1-58. Video: Clips 1-40, National Geographic and conversation practice videos.
Dellar H., Walkley A. — 2nd edition. — National Geographic Learning, a part of Cengage Learning, 2017. Audio: Tracks 1-58. Video: Clips 1-40, National Geographic and conversation practice videos
Dellar H., Walkley A. — 2nd edition. — National Geographic Learning, a part of Cengage Learning, 2017. Audio: Tracks 1-58. Video: Clips 1-40, National Geographic and conversation practice videos
Dellar H., Walkley A. — 2nd edition. — National Geographic Learning, a part of Cengage Learning, 2017. Audio: Tracks 1-58 /Video: Clips 1-40, National Geographic and conversation practice videos
Dellar H., Walkley A. — 2nd edition. — National Geographic Learning, a part of Cengage Learning, 2017. Audio: Tracks 1-58. Video: Clips 1-40, National Geographic and conversation practice videos.