Bibliography is presently implemented to conform to common convention followed by academic papers. It is based on an internal database which, I admit, is quite uncomfortable to edit and extend. However, built-in tools make it easy to customise and create the bibliographic table.
If you prefer a [1]-style of references, I’d suggest going for endnotes. This means your document can only use footnotes in case you need notes so that there is a clear separation between notes and bibliography. A serious inconvenience is you lose part of the automated process.
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Entering new references
Type the opening bracket [, enter your bibliography entry Insert>Footnote & Endnote>Endnote, then type the closing bracket ].
To avoid the superscript position of note anchor, modify character style Endnote Anchor: in tab Position, select Normal (to be done only once).
Also, endnotes are by default numbered roman. To change for ordinary numbers, open Tools>Footnotes & Endnotes, tab Endnotes, and select your favourite numbering style (also to be done only once). This same dialog also controls the appearance of entries in the endnotes section. Type the brackets in the Before and After text box.
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Entering already existing references
This is a reference to an already typed entry.
Type the opening bracket, then Insert>Cross-reference. In the pop-up dialog, select Endnotes from Type, Chapter (read here “note number”) from Insert reference to and the entry from Selection. Click Insert and close the dialog. Finally type the closing bracket.
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Formatting the bibliography table
Endnotes are generated in their own “section” after a page break. Page style is Endnote. Modify this page style to add a header and make other adjustments. A header is necessary because you won’t be able to add a blank paragraph before the first endnote. Consequently bibliography title can only be given in page header.
I tried to add another Endnote page before the first entry but Writer insists on adding an internal page break on the first entry which I can’t remove. Unless you have bibliography title on a page by itself, a header is the pragmatic solution.
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