Title: Mandarin Chinese Characters Language Practice Pad: Learn Mandarin Chinese in Just a Few Minutes Per Day! (Fully Romanized), Author: Xin Liang
Title: Chinese Flash Cards Kit Volume 1: HSK Levels 1 & 2 Elementary Level: Characters 1-349 (Online Audio for each word Included), Author: Philip Yungkin Lee
Title: Chinese in a Flash Kit Volume 4, Author: Philip Yungkin Lee
Title: A Chinese Character a Day Practice Pad Volume 2: (HSK Level 3), Author: Philip Yungkin Lee
Title: Chinese Flash Cards Kit Volume 2: HSK Levels 3 & 4 Intermediate Level: Characters 350-622 (Online Audio Included), Author: Philip Yungkin Lee