The Short Version
Kolb's 1984 book *Experiential Learning* does indeed describe learning as a four-stage cycle of concrete experience, reflective observation, abstract conceptualization, and active experimentation — matching the claim's shorthand labels. The primary source and numerous independent academic references uniformly confirm this. While earlier versions of the model may date to the mid-1970s, the 1984 publication is the canonical, definitive statement of the theory, making the claim's attribution accurate.