Add new user-defined bibliography entry types

Is there any way to add additional user-defined entries for bibliography? In some citation styles are different “subtypes” e.g. for a website which are incompatible with each other and having only 5 user-defined entries is not enough.

You’ll need to modify the database schema. The bibliography database is stored in your user profile in the Database/ subdirectory. Make a copy of it and experiment.

Take note you can have only one bibliography database, consequently backup your present one if you stuffed it with personal data. You’ll very easily lose all your work if you are not cautious enough.

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(edit only added missing “lose” word without which the sentence is obscure)