Yeah, it's a bit of a problem but not that difficult to search for the book on Amazon and then on Google to locate the publishers. Also always check wikipedia f

Yeah, it's a bit of a problem but not that difficult to search for the book on Amazon and then on Google to locate the publishers. Also always check wikipedia for details (eg: https://en.wikipedia.org/wiki/How_to_Solve_It https://en.wikipedia.org/wiki/How_to_Solve_It). For classics like Polya also check used book stores (in addition to Amazon) like https://www.betterworldbooks.com/ https://www.betterworldbooks.com/ https://www.thriftbooks.com/ https://www.thriftbooks.com/ etc. where you can get good editions for cheap.