Gillings, R. J. (1964), "The volume of a truncated pyramid in ancient Egyptian papyri", The Mathematics Teacher, 57 (8): 552–555, doi:10.5951/MT.57.8.0552, JSTOR27957144.
Gillings, R. J. (1964), "The volume of a truncated pyramid in ancient Egyptian papyri", The Mathematics Teacher, 57 (8): 552–555, doi:10.5951/MT.57.8.0552, JSTOR27957144.