Abraham, Kelvin. (2021). Tetryonics : principa geometrica Retrieved December 2, 2022, from http://nla.gov.au/nla.obj-2994677273
Abraham, Kelvin. Tetryonics : principa geometrica Regents Park, Qld: Kelvin Abraham, 2021. Web. 2 December 2022 <http://nla.gov.au/nla.obj-2994677273>
Abraham, Kelvin. 2021, Tetryonics : principa geometrica Kelvin Abraham, Regents Park, Qld viewed 2 December 2022 http://nla.gov.au/nla.obj-2994677273
| author1=Abraham, Kelvin.
| title=Tetryonics : principa geometrica
| section=1 online resource (1397 pages : colour illustrations and charts)
| edition=Third edition.
| location=Regents Park, Qld
| publisher=Kelvin Abraham
| access-date=2 December 2022
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