How to show ExactOneSAT is NP-Complete?

Question

$\text{ExactOneSAT}= \{\phi\;|\;\phi\; \text{is a boolean formula}$ $\text{ such that it has a satisfying assignment with only one true literal per clause} \}$

I am trying to reduce 3SAT to this problem but can't find a way. I tried taking a small example $\phi=(x_1 \vee x_2) \wedge (\overline{x_1} \vee x_2 ) $. In this example the formula can only be satisfied only when both $x_1,x_2$ are True. How do I reduce such a case of 3SAT to ExactOneSAT ?
This is an exercise from Sanjeev Arora and Barak Boaz : A modern approach to complexity, but not a homework exercise.