Cornelius C. Kubler 
Intermediate Spoken Chinese [EPUB ebook] 
A Practical Approach to Fluency in Spoken Mandarin (Downloadable Audio Included)

‘A breath of fresh air… Its dual track for spoken and written language finally gives American students a chance to develop oral proficiency without being slowed down by the character writing… An ideal textbook for any program that seeks to advance rapidly in spoken Chinese and to fully prepare the students for their encounter with China. –
Dr. Jingqi Fu, Associate Professor of Chinese, St. Mary’s College of Maryland ‘