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Heald, Paul J. 2020. COPY THIS BOOK! What data Tells Us about Copyright and the Public Good. Stanford University Press. https://books.google.co.za/books?id=AZQAEAAAQBAJ&printsec=frontcover&dq=copy+this+book!+What+data+tells+us+about+copyright+and+the+public+good
Heald, P. J. (2019). The effect of copyright term length on South African book markets (with reference to the Google book project). South African Intellectual Property Law Journal, 7, 71–98.