a book of doubtful authorship的用法和样例：
- A book of letters written by Mother Teresa of Calcutta -- now Kolkata -- has revealed that she was deeply tormented about her faith and suffered periods of doubt about God.
- I need a book of regular stamp and two of airmail.
- Half a dozen air mail labels and a book of stamps.
- The petrified tree was a book of nature.
- That is a book of the same nature.