It is from his book "A Life on the Road".

VOA: special.2010.01.30

A Life of Her Own is a book that I became obsessed with, oh, about five or six years ago.

她的人生》是一本让我着迷的书,大概五六年前

耶鲁公开课 - 1871年后的法国课程节选

"The book is Darwin's Universe: Evolution from A to Z, and it is a life's work,"

VOA: standard.2009.11.25