Choosing Type opens the Entry Type Menu. This menu
contains the names of all permissible entry types, as defined in the
configuration file (the supplied configuration file defines all types defined
in the standard BibTEX style files). You can move about in this menu using
the arrow keys, or by typing the first letter of the desired type. If more
than one type starts with that letter, type the first letter until you get to
your choice. Select the highlighted item by pressing <ENTER>.
Alternatively, you can select a type by clicking on it with the mouse.