I certainly wouldn't depend on everyone owning a Sony. There are many devices without a dedicated back button. Personally the [1] idea works the best and end notes at the end of each chapter works the best as that way a new file does not have to be loaded but it will work at the end of the document as well. Here is one place that Word does a good job in that footnotes in word will be back linked when it is saved at an html.
Dale
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