Renderings of the "Transitional-style" (a) Tata Kala, (b) Wakullani, and (c) Ídolo Plano monoliths. Drawing by Arik Ohnstad.
Isbell, William H.; Uribe, Mauricio I.; Tiballi, Anne; Edward P. Zegarra, 2018, "Visual database", https://doi.org/10.25346/S6/1B33FN.