Buttelmann D, Buttelmann F, Carpenter M, Call
J, Tomasello M (2017) Great apes distinguish true from false beliefs in
an interactive helping task. PLoS ONE 12(4):
e0173793.
https://doi.org/10.1371/journal.pone.0173793
The machine readable form is made available here, along with an R script for importing the data and conducting a basic mixed-effects analysis of the data.
You must reference Buttelmann. You may use the FigShare doi, but there is no need to reference me.