In the original Army Lists and the Human Sphere ones it says it under their stat-line, either "not-impetuous" "impetuous" or "frenzy".
In the Campaign Paradiso Army List, there is a key up the top of each page showing the icons for "impetuous" (a red swoopy arrow) and "frenzy" (an orange zig-zag arrow) and if a profile displays neither of them, it's assumed to be "not-impetuous".
Furthermore, if you use the
official online army builder you will find those same icons used on the profiles to indicate their level of fury.
I hope that helps you to clear things up.
edit: P.S: You may be mixing up fury and frenzy, I know I did at first: Fury is the broad name for the rule, and Frenzy is a specific form of it, you can read more about it
on the official wiki