It looks correct. I thought of how to do it from a different point of view. You want to shrink the bolt so that the change in length equals the coeff of thermal expansion * change in temperature*original length:
(Delta-L) = (alpha)*(Delta-T)*(L).
Once it is shrunk by that amount, you want to apply a tension force to the bolt to stretch it back to it's original length:
F = [(Delta)-L]* (AE/L)
Substituting for Delta-L (the change in length):
F = (alpha)*(Delta-T)*(AE)
Where F is in pounds of axial force (not the psi units the article uses).