Protzen & Nair 2000. Protzen, Jean-Pierre; Nair, Stella (2000). "On Reconstructing Tiwanaku Architecture". Journal of the Society of Architectural Historians. 59 (3): 358–371. doi:10.2307/991648. JSTOR991648.
Protzen & Nair 1997. Protzen, Jean-Pierre; Nair, Stella (1997). "Who taught the Inca stonemasons their skills? A comparison of Tiahuanaco and Inca cut-stone masonry". Journal of the Society of Architectural Historians. 56 (2): 146–167. doi:10.2307/991281. JSTOR991281.
Protzen & Nair 2000. Protzen, Jean-Pierre; Nair, Stella (2000). "On Reconstructing Tiwanaku Architecture". Journal of the Society of Architectural Historians. 59 (3): 358–371. doi:10.2307/991648. JSTOR991648.
Protzen & Nair 1997. Protzen, Jean-Pierre; Nair, Stella (1997). "Who taught the Inca stonemasons their skills? A comparison of Tiahuanaco and Inca cut-stone masonry". Journal of the Society of Architectural Historians. 56 (2): 146–167. doi:10.2307/991281. JSTOR991281.
Visual History – Online-Nachschlagewerk für die historische Bildforschung: Historische Fotobestände aus Südamerika im Archiv für Geographie (Leipzig), accessed on April 11, 2021; Fig. 3 shows the Pumapunku monolith; Picture note: Im Jahre 1877 umgeworfen und zerbrochen (knocked over and broken in year 1877).