I was going to say the same, no attribution at all, and dubious claims about how your success will increase.

I believe the talent stack is a valid principle, but it doesn't just double your success if you go to toastmasters and learn how to present and at your job you have neither a commission nor any customer contact.

He does attribute, right in the second line of the whole piece:

>> The more skills we have, the more odds we have to become successful. I like how Scott Adams, the creator of Dilbert, explains the concept of Skill Stacking ...

My bad, skimmed it very quickly and didn't see that.

I searched the page text for Adams before I posted and saw nothing. I guess I missed it too somehow or the page was updated.